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Light its nature and behaviour By Malik Shahroz
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Light its nature and behaviour By Malik Shahroz

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  • 1. Light, Behavior and its NatureLight, Behavior and its Nature By; Malik Shahroz Akber
  • 2. LightLight Light is a energy by which human eye is sensitive OR Light is a natural agent which stimulates sight and makes things visible
  • 3. LightLight Without light, nothing is visible. When you look at fish in the ocean, you are not seeing fish. What you are really seeing is light reflected from the fish!
  • 4. LightLight Light Is a transverse , electromagnetic wave that can be seen by human beings. Energy generated by sun, electric light ,fire travels as a radiation from source and can be detected by human eyes. Two forms of light are: 1- Incandescence light: 2- Luminescence light:
  • 5. Incandescence lightIncandescence light The emission of light from hot matter is incandescence light.
  • 6. Luminescence lightLuminescence light The emission of light ,when excited electrons fall from higher energy level to low energy level.
  • 7. A luminous object is one that produces light. An illuminated object is one that reflects light. Luminous Object Illuminated Object Luminous and Illuminated ObjectsLuminous and Illuminated Objects
  • 8. Nature Of LightNature Of Light Light rays travel in the transparent medium present in the form of particles When travel through vacuum present in the form of wave
  • 9. Materials can be transparent, translucent, or opaque. Each type of material affects the behavior of light in different ways Nature Of LightNature Of Light
  • 10. Transparent MaterialsTransparent Materials A material through which you can see clearly. A transparent material transmits light, which means it allows most of the light that strikes it to pass through it. Some examples: windows and fresh water.
  • 11. Translucent MaterialsTranslucent Materials A material that you can see through, but the objects you see through it do not look clear or distinct. A translucent material scatters light. Example: Jell, Soap
  • 12. Opaque MaterialsOpaque Materials A material that either absorbs or reflects all of the light that strikes it. (It blocks light from passing through it.) Most materials are opaque. Examples: Trees, concrete, metals
  • 13. Interactions of LightInteractions of Light When light strikes a new medium, the light can be reflected, absorbed, or transmitted. When light is transmitted, it can be refracted, polarized, or scattered.
  • 14. ReflectionReflection When you look in a mirror, you see a clear image of yourself. An image is a copy of an object formed by reflected waves of light. There are two types of reflection : regular and diffuse.
  • 15. Regular ReflectionRegular Reflection This occurs when parallel light waves strike a surface and are all reflected in the same direction. Regular reflection happens when light hits a smooth, polished surface. -Mirrors and still bodies of water
  • 16. Diffuse ReflectionDiffuse Reflection This occurs when parallel light waves strike a rough, uneven surface, and reflect in many different directions. When this happens, you can see either a blurred reflected image or no image at all. -Rough water, paper.
  • 17. Law of Reflection:Law of Reflection: Angle of incidence = angle of reflection
  • 18. Transmitting LightTransmitting Light If light is not reflected, three things can happen as light passes through an object: -Refraction, Polarization, Scattering
  • 19. Refraction= BendingRefraction= Bending Refraction occurs when waves bend when it passes at an angle from one medium into another. This can also happen to light! This is seen when you place objects under water.
  • 20. PolarizationPolarization Polarization occurs when light waves vibrate in only one plane. Light is normally “un-polarized,” meaning it vibrates in all directions. Polarizing filters transmit light waves, but they block all of the light that isn’t vibrating in the direction it allows through it.
  • 21. PolarizationPolarization This technology is now used in 3-D movies! 3-D movies are produced in a way that makes it so the image that is projected on the screen is really two images (one for your right eye, and the other for your left eye). This is why, if you take your 3-D glasses off, you will see a blurry
  • 22. ScatteringScattering Scattering means that light is redirected as it passes through a medium. The earth’s atmosphere contains many molecules. When light from the sun hits these particles, they scatter the light. Scattering reddens the sun at sunset and sunrise.
  • 23. Nature Of LightNature Of Light The following theories explains the nature of light THE CORPUSCULAR THEORY created in seventeen century By sir Isaac Newton States that light emitted by luminous object consist of tiny particles of matter called corpuscles
  • 24. Nature Of LightNature Of Light WAVE THEORY Created in seventeen century By sir Christian Hygiene states that light is emitted in series of waves that spreads out from a light source in all direction
  • 25. ELECTROMAGNETIC THEORY Created in nineteen century By James Maxwell States that light posses both electric and magnetic properties and can travels through a vacuum Light wave is a part of EMR and make up EMS Nature Of LightNature Of Light
  • 26. Nature Of LightNature Of Light QUANTUM THEORY Created in nineteen century By Max Planck States that light waves travels as a separate packets of energy called “quanta” or “photons”. correct and accurate theory