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ICSE Class 8 Notes 2020 : Physics

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CHINMAYA VIDYALAYA (E.M.) CLASS:8 SUB:PHYSICS NOTES OF REFRACTION OF LIGHT THROUGH A GLASS SLAB Refraction of light When the light rays either bend or change their direction while passing from one medium to another it is called refraction of light. The refraction of light takes place when light travels from air into glass, from glass into air, from air into water or from water into air. The example of optical instruments that work on the basis of refraction of light are camera, microscope etc. Incident ray: The light rays passing from air into glass or water are called incident rays. Refracted ray: When the light rays bend after passing into another medium, they are called refracted rays. Normal: The point of incidence is called normal. Angle of incidence: The angel between incident ray and normal is called angel of incidence. Angle of refraction: The angel between refracted ray and normal is called angle of refraction. The angle of refraction is either smaller or greater than angle of incidence. Causes of refraction Light travels in different speed in different mediums. For example light travels faster in air than in a glass. Therefore, it is due to the change of speed of light in different medium that the light rays are refracted.

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