Optics Question 717
Question: Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is
[NCERT 1976; MP PET 1994; CBSE PMT 1996; KCET 1994; MP PMT 1999, 2001]
Options:
A) $ \frac{t}{nc} $
B) $ tnc $
C) $ \frac{nt}{c} $
D) $ \frac{tc}{n} $
Show Answer
Answer:
Correct Answer: C
Solution:
$ time=\frac{distance}{speed}=\frac{t}{c/x}=\frac{nt}{c} $
