Question

26.
Refractive index of glass is 1.5 and velocity of light in air is 3 x 108 m/s. Then the timetaken to travel a distance of 4 x 108 m in glass is:
a) 6 s
b) 4 s
c) 2 s
d) ls
ns​

Answer 1

Answer:

c.) 2 s

Explanation:

refractive index of glass = 1.5

velocity of light in air =3×10^8

= 3×10^8/1.5

= 2×10^8

therefore, time taken by lightin traveling 4×10^8m glass is:

4×10^8/2×10^8

= 2s