Physics
Grade-10
Easy
Question
Light from air at a temperature of 27 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 away from 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 R.I of 27 >R.I of 29
- When light travels from a denser medium to a rarer medium, it bends away from the normal, as illustrated to the left. This behavior follows from Snell's Law. As you saw before, the larger angle must be in the medium having the lower index of refraction.
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