science
Grade-7
Easy
Question
A light ray bends towards the normal on entering a medium from the air. Which of the following cannot be the second medium?
- Water
- Glass
- Air
- Kerosene
Hint:
When a ray of light from air enters a denser medium, it bends towards the normal.
The correct answer is: Air
- Refraction is the bending of light rays after entering a medium where its speed is different. Due to refraction of light, when a ray of light passes from a rarer medium to a denser medium, it bends towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media. Hence, when a ray of light from air enters a denser medium, it bends towards the normal.
- Hence second medium should be denser than air.
- Hence second medium cannot be air as second medium should be denser than first.
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