Notes Science class 7 Unit 9 Dispersion of Light
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Let us start with notes on Science.
1. What happens, when light travels from a glass into the air at an angle?
Ans: When light passes from a glass into the air, it bends away from the normal. The angle of incidence is greater than the angle of refraction.
2. What is the refractive index?
Ans: Refractive index is the ratio of the speed of light in a vacuum to its speed in the medium.
Refractive index of the medium =