Refraction
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The document discusses key concepts of reflection and refraction of light. It explains that for light reflecting off a plane mirror, the angle of reflection is equal to the angle of incidence. It also describes how light refracts or bends as it passes from one medium to another of different optical density, moving toward or away from the normal. The document further explains the phenomenon of total internal reflection, which occurs when light hits the interface between two optically dense materials at an angle greater than the critical angle, causing all of the light to reflect rather than refract.
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Most of the times this study confused me...so, i just put some important points in one place to easily keep them in mind..hope it will help other students as well..and inform me, if a reader find anything new to improve it further.
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Use principles of reflection and refraction to describe how lenses and mirrors work.
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This document discusses key properties of light including reflection, refraction, diffraction, and interference. Reflection occurs when light bounces off a surface, following the law that the angle of incidence equals the angle of reflection. Refraction is the bending of light when passing from one medium to another at different speeds. Diffraction causes light to bend around barriers depending on the wavelength and barrier size. Interference results from the constructive or destructive combination of crests and troughs when light waves meet.
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This document discusses the concepts of light reflection. It defines reflection as light bouncing back when striking a surface. There are two types of reflection: regular and irregular. Regular reflection occurs on smooth surfaces, keeping parallel rays parallel after reflection. Irregular reflection on rough surfaces scatters rays in different directions. The document also discusses laws of reflection, types of images (real and virtual), characteristics of images formed by plane and spherical mirrors, and key terms like focal length, radius of curvature, and principle axis.
light
Light is the part of the EM spectrum which we can see.Light travels in straight lines called rays.A bundle of rays is known as a beam of light.
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- Reflection of light occurs when a ray of light changes direction after striking a smooth surface without passing through. The angle of incidence equals the angle of reflection.
- Refraction occurs when light passes from one medium to another of different optical density, causing the ray to bend. The ratio of sines of angles of incidence and refraction is a constant called the refractive index.
- Total internal reflection occurs when light travels from an optically dense to a rare medium at an angle greater than the critical angle, causing all the light to be reflected back into the dense medium. This principle is used in optical fibers.
Powerpoint presentation on light
The document is a PowerPoint presentation about light and related phenomena submitted by Deepa Krishnan to her lecturer Mrs. Linimol K.S. It discusses refraction, the laws of refraction, total internal reflection which is responsible for fiber optics, mirages as an example of total internal reflection, reflection, types of reflection, dispersion, and rainbow formation due to dispersion of light in raindrops.
Light - 8th standard Science Notes .pptx
Light comes from sources like the sun and enables us to see visible light. Our eyes perceive light when it bounces off objects after hitting them. Light bounces, or reflects, off surfaces at the same angle that it hits under the laws of reflection. The angle of incidence is equal to the angle of reflection, and both lie in the same plane as the normal line perpendicular to the surface. Reflection can be regular or diffuse depending on the smoothness of the surface. Plane mirrors form virtual images that are upright and equidistant from the mirror, undergoing lateral inversion. Multiple mirrors produce multiple reflections and infinite images between parallel mirrors.
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Refraction
- 1. The King David High School Science Department Reflection and Refraction By Mr Jones
- 2. Reflection For light reflecting off a plane mirror (flat, smooth, shiny): Normal Reflected Ray Incident Ray The normal is a line drawn at right angles (perpendicular) to the surface. i r Mirror = Angle of reflection (r) Angle of incidence (i)
- 3. Reflection For light reflecting off a plane mirror (flat, smooth, shiny): Mirror = Angle of reflection (r) Angle of incidence (i)
- 4. Refraction Incident Ray Normal Air Perspex Refracted Ray Normal Emergent Ray
- 7. As light passes from a more optically dense material into a less optically dense material it moves away from the normal. Normal Incident Ray Less optically dense More optically dense More optically dense Less optically dense Emergent Ray Normal
- 14. A tiny amount of light is reflected at the interface. Incident Ray Reflected Ray i<42° Refracted Ray
- 16. Some light is reflected at the interface.
- 17. 42° is described as the critical angle.Incident Ray 42° 90°
- 19. All of the light is reflected.
- 20. This is known as total internal reflection.Incident Ray Reflected Ray i>42°