DISPERSION OF WHITE LIGHT THROUGH A GLASS PRISM
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The document discusses the dispersion of white light through a prism and the formation of rainbows. It explains that white light consists of all visible colors, and when passed through a prism or water droplets, the different colors disperse at different speeds and angles. This causes the colors to separate, forming a visible spectrum. Newton's experiment showed that passing the dispersed light through a second prism recombines the colors back into white light. Rainbows form when sunlight enters water droplets in the atmosphere and disperses internally before refracting back out.
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Dispersion of light
The document discusses the dispersion of light through a glass prism and the formation of a rainbow. It explains that dispersion occurs because different colors of light travel at different speeds in glass and are refracted by different angles when passing through a prism. This causes white light to separate into the colors of the visible spectrum - violet, blue, green, yellow, orange and red. Newton performed an experiment showing that white light consists of colors by passing light through two prisms and recombining the colors. Rainbows are formed when sunlight is dispersed and reflected inside water droplets in the atmosphere.
Dispersion of light
The document discusses how a prism splits white light into a spectrum or band of colors. When white light passes through a prism, it disperses the different wavelengths of light, with red light bending the least and violet light bending the most. This causes the different colors to emerge along separate paths and become visible. Isaac Newton used a prism to first demonstrate that white light is made up of a combination of the seven colors - violet, indigo, blue, green, yellow, orange and red. He was able to recombine the colors using a second prism positioned in the opposite orientation of the first.
Dispersion
This PPT gives an elementary idea about dispersion. The dispersion through prism is discussed in some details & combination of prisms are made to make either dispersion or deviation to be equal to zero.
Refraction of light
This document discusses the refraction of light. It defines refraction as the change in direction of light when passing from one medium to another. It states that light bends away from the normal when traveling to a less dense medium, and toward the normal when traveling to a denser medium. Snell's law is introduced, which states that the ratio of sines of the angle of incidence and refraction is a constant. Refractive index is defined as the ratio of speed of light in a vacuum to that in a medium. Lens equations and image formation by convex and concave lenses are briefly covered.
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Light is part of the electromagnetic spectrum that is visible to the human eye. It travels in straight lines called rays. Reflection is when light bounces off a surface, following the laws that the angle of incidence equals the angle of reflection and that the incident, normal, and reflected rays lie in the same plane. Refraction is when light changes speed and direction as it passes from one medium to another due to the different refractive indices, following Snell's law. Total internal reflection occurs when light cannot pass from an optically denser medium to a less dense one if the angle of incidence exceeds the critical angle.
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Refraction of light
Light refracts when passing from one medium to another with a different density. When light travels from a less dense to a more dense medium, it bends toward the normal, and when traveling from more dense to less dense, it bends away from the normal. The refractive index is a ratio of the speed of light in a vacuum to the speed in a particular medium, and is represented by the Greek letter μ. Snell's law describes the relationship between the angles of incidence and refraction.
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This document discusses the refraction of light. It defines refraction as the change in direction of light when passing from one medium to another. It states that light bends away from the normal when traveling to a less dense medium, and toward the normal when traveling to a denser medium. Snell's law is introduced, which states that the ratio of sines of the angle of incidence and refraction is a constant. Refractive index is defined as the ratio of speed of light in a vacuum to that in a medium. Lens equations and image formation by convex and concave lenses are briefly covered.
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Light is part of the electromagnetic spectrum that is visible to the human eye. It travels in straight lines called rays. Reflection is when light bounces off a surface, following the laws that the angle of incidence equals the angle of reflection and that the incident, normal, and reflected rays lie in the same plane. Refraction is when light changes speed and direction as it passes from one medium to another due to the different refractive indices, following Snell's law. Total internal reflection occurs when light cannot pass from an optically denser medium to a less dense one if the angle of incidence exceeds the critical angle.
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Light is a form of energy that allows us to see objects. When light reflects off objects and enters our eyes, we see the objects. There are two main types of reflection: irregular/diffused reflection which scatters light in all directions for general illumination, and regular/specular reflection which forms images using smooth, shiny surfaces like mirrors. Spherical mirrors can be either concave which converge light to a focal point, or convex which diverge light appearing to come from a point behind the mirror. The mirror formula relates the object and image distances to the focal length. Concave mirrors are used in flashlights and car headlights while convex mirrors are used as rear view mirrors in vehicles.
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Visible light consists of different colors that are separated when passing through a prism. Each color corresponds to a distinct wave frequency, with higher frequencies bending more upon refraction. Materials have an optical density that slows light, measured by the index of refraction. Higher values correspond to greater slowing of light. This difference in indexes causes dispersion, separating white light into a rainbow spectrum. Refraction and reflection in water droplets create rainbows, with red light refracting at a greater angle towards observers. Non-uniform air density above hot roads can refract light to create mirages, making objects above roads appear on the road surface.
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This document discusses the properties of light, reflection, refraction, and lenses and mirrors. It defines key terms like reflection, refraction, focal length, and image formation. Reflection and refraction follow laws - the law of reflection states the angle of incidence equals the angle of reflection, and Snell's law relates the sines of the angles of incidence and refraction. Spherical mirrors and lenses follow mirror and lens formulas to determine image locations. Images can be real or virtual depending on the object position relative to the focal point.
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The document provides an overview of key concepts related to light and vision. It includes lessons on what light is, how light interacts with matter, using lenses, and the anatomy and function of the human eye. Specifically, it defines key terms like wavelength, frequency, medium, electromagnetic spectrum. It describes how light can be absorbed, transmitted, scattered, and refracted when interacting with matter. It also explains lens concepts such as focal point, focal length, and how lenses are used in optical instruments like cameras, telescopes, and microscopes. Finally, it outlines the major parts of the eye including the cornea, iris, pupil, lens, and retina and how they work together to form images.
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Light travels extremely fast at around 300,000 km/s. It travels in straight lines and we see objects because they reflect light into our eyes. There are two types of reflections - clear reflections from smooth surfaces and diffuse reflections from rough surfaces which scatter light in different directions. White light is made up of all the colors of the rainbow, and objects appear a certain color because they reflect only certain wavelengths of light while absorbing others.
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The document discusses the electromagnetic spectrum and visible light. It begins by discussing dispersion and rainbow formation. It then covers the characteristics of visible light, including that it is made up of different wavelengths/frequencies that correspond to colors. When white light is passed through a prism, it is dispersed into the colors of the visible light spectrum. The document also discusses color perception in objects and mixing of light colors. It explores sources of light, including natural and artificial sources. Finally, it discusses color blindness and the different types, including dichromacy and anomalous trichromacy.
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White light is a mixture of many colors. When white light passes through a prism, it disperses and separates into the visible color spectrum of red, orange, yellow, green, blue, indigo and violet (ROYGBIV). The arrangement of colors from red to violet is due to the different wavelengths of the color light waves, with violet having the highest frequency and energy and red having the lowest frequency and energy.
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The Physics of Light, ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Light PP.ppt
1. Light travels in straight lines and can be reflected or refracted. Reflection occurs when light bounces off a surface, while refraction is when light changes speed and direction when passing through different materials.
2. Mirrors come in different shapes that determine whether images are virtual or real, and lenses use refraction to bend light and form images. Concave lenses form virtual images while convex lenses form real images.
3. White light is composed of all visible wavelengths combined, and different materials reflect or absorb particular wavelengths, determining their perceived color. Color mixing with light follows the same principles as mixing with pigments. Filters can be used to selectively transmit or block certain wavelengths of light.
COLOR_OF_LIGHTS.ppt
Electromagnetic waves interact with materials in several ways that determine the color perceived. Color arises from emission, reflection, transmission, interference, dispersion, and scattering of light waves interacting with objects. The primary colors of light are red, green and blue, which combine to make white light. The primary colors of pigment are cyan, yellow and magenta, which combine to make black. Reflection, refraction, polarization, and interference cause the wide variety of colors observed from different materials due to the interaction of light waves.
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physics behind light
In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. ... Like all types of EM radiation, visible light propagates as waves. However, the energy imparted by the waves is absorbed at single locations the way particles are absorbed.
physics behind light
In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. ... Like all types of EM radiation, visible light propagates as waves. However, the energy imparted by the waves is absorbed at single locations the way particles are absorbed.
Properties and characteristics of light 4
Light is an electromagnetic wave that travels in straight lines and does not require a medium. It reflects at the same angle it strikes a surface, such as a mirror. Refraction occurs when light passes from one medium to another, such as from air to water, causing the light to bend. The primary colors of light are red, green, and blue, and when combined produce white light. Light travels at 300,000 km/s and has properties of waves like crests, troughs and wavelength. The visible light spectrum ranges from long wavelength red light to short wavelength violet light.
clem_waves_lesson03_presentation.ppt
Light travels as waves in the electromagnetic spectrum at different wavelengths. It travels fastest in a vacuum at 300,000 km/s and slower in other materials. Light interacts with objects by being absorbed, reflected, or transmitted. The wavelength of visible light is between 400-700 nm. Color is determined by the wavelengths of light reflected or emitted from an object. Reflection can be regular from smooth surfaces or diffuse from rough surfaces. Refraction occurs when light changes speed as it passes through different materials due to atomic interactions. Lenses and prisms can bend light through refraction and dispersion. Lasers emit coherent, monochromatic light that is used for applications like welding and fiber optics.
clem_waves_lesson03_presentation.ppt
Light travels as waves in the electromagnetic spectrum at different wavelengths. It travels fastest in a vacuum at 300,000 km/s and slower in other materials. Light interacts with objects by being absorbed, reflected, or transmitted. The wavelength of visible light is between 400-700 nm. Color is determined by the wavelengths of light reflected from an object. Monitors produce color using red, green and blue light while objects use pigments that absorb certain wavelengths. Reflection and refraction of light can be regular, diffuse, or involve total internal reflection as in fiber optics. Lasers produce coherent light of one wavelength.
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Light of different wavelengths is perceived as different colors. Only light generates color, and light sources like the sun emit light waves of varying wavelengths. The human eye can see wavelengths between 380-720 nm, which correspond to the colors of the visible spectrum from violet to red. Color is produced when light waves of different wavelengths are combined additively. Different light sources have varying spectral distributions that determine the colors they produce.
Colourful world 1
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DISPERSION OF WHITE LIGHT THROUGH A GLASS PRISM
- 3. CONTENT • DISPERSION OF WHITELIGHT THROUG A PRISM • WHAT IS RAINBOW ?
- 4. What is Dispersion? The splitting up of white light into its seven constituent colors on passing through a transparent medium (like glass prism) is called dispersion of light.
- 6. Cause of Dispersion The dispersion of white light occurs because colors of white light travel at different speeds through the glass prism. The amount of refraction depends on the speed of colored light in glass. Now, since the different colors travel at different speeds, they are refracted by different angles on passing through the glass prism. So, when white light consisting of seven colors falls on a glass prism, each colour in it is refracted by a different angle, with a the result that seven colors spread out to form a spectrum.
- 7. Spectrum The band of seven colors formed on a white screen, when a beam of white light is passed through a glass prism, is called spectrum of white light. The seven colors of the spectrum are: Violet, Indigo, Blue, Green, Yellow, Orange, and Red. It can be denoted by the word VIBGYOR.
- 9. Newton’s Experiment Newton performed an experiment to show that white light consist of colors. A white light ray is passed through a prism to split it into the colors of the spectrum. The different colored light is allowed to pass through an identical prism kept in inverted position. The light emerging out of second prism was found to be white indicating that the light ray consist of colors.
- 11. Rainbow A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun. The water droplets acts like a small prism. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrop. Due to the dispersion of light and internal reflection, different colors reach the observer’s eye.
- 14. Lets Find Out More Facts
- 15. What is the range of visible light? • Range of visible light – 0.4 microns to 0.7 microns. • Visible light has a large number of radiations having wavelengths ranging from 0.4 microns to 0.7 microns. That is, red light has a large wavelength compared to violet light.
- 16. Which component deviates maximum? • The violet colour has the minimum speed in prism, so the violet colour is deviated the maximum.
- 18. Which component deviates minimum? • The red colour has the maximum speed in prism, so the red colour is deviated the minimum.
- 20. Rate of photosynthesis? • Wavelength of the component that increases the rate of photosynthesis - 0.7 microns. • The rate of photosynthesis is the most in the presence of red light.
- 22. Which colour doesn’t affect the rate of photosynthesis? • Component which does not affect the rate of photosynthesis - green light. • The rate of photosynthesis is zero in the presence of green light.
- 24. What is the nature of the spectrum emerging out of the first prism? • Nature of the spectrum emerging out of the first prism - a band or spectrum of seven colors is obtained. • The prism splits white light into seven colors.
- 26. What is the nature of the spectrum emerging out of the second prism? • Nature of the spectrum emerging out of the second prism – white light is obtained. • The seven colors of the visible spectrum combine to form white light.
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