Physics
Grade-10
Easy
Question
Light from air at a temperature of 37 degrees Celsius enters a layer of the atmosphere at 29 degrees Celsius. The light ray ______ on entering the latter.
- Bends away from the normal line
- Bends towards the normal line
- Bends to align itself to the normal line
- Does not bend at all
Hint:
Refractive index of a medium decreases with the increase in temperature
The correct answer is: Bends towards the normal line
Refractive index of a medium decreases with the increase in temperature. With the increase in temperature, the speed of light in that medium increases; thus, the refractive index decreases.
So Refractive index of 37<Refractive index of 29
so light travels from one medium to another, the rays bend towards or away from the normal. This is called refraction. When light moves from rarer to denser mediums, the rays are bent towards the normal.
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