BPSC – Combined Competitive Examination · Question 114
In which medium will the speed of light be minimum?
Show answer & explanation
Answer: (C) Glass
Explanation
Speed of light = c/n; the higher the refractive index, the slower the light.
- (A) Incorrect
Wrong: maximum in vacuum.
- (B) Incorrect
Wrong: nearly as fast as in vacuum.
- (C) Correct
Correct: glass (n ≈ 1.5) slows light the most here.
- (D) Incorrect
Wrong: n ≈ 1.33, less than glass.
- (E) Incorrect
Wrong: only one of the options A–D is correct.