Question
Physics Question on Ray optics and optical instruments
A beam of light passes through layers of following different substances each 10 cm thick normally. In which substance does the beam take more time to pass through
A
glass slab (n = 1.5)
B
water (n = 1.33)
C
fibre glass (n = 1.65)
D
alcohol (n = 1.36)
Answer
fibre glass (n = 1.65)
Explanation
Solution
Fibre glass being densest of all will slow the passage of light through it.