Question

A ray of light covers 100 m in vacuum in acertain time. How much distance will it cover in glass of refractive index 1.5 in the same time?​

Answer 1

Please find the explanation attached. Hope this helps. Thanks

Answer 2

Time taken by light in vaccum = 100/c

n = c/v

v = c/n = 3*10^8/1.5 = 2*10^8m/s

Distance = v*t

Distance = 2*10^8*100/3*10^8

Distance = 66.6 m

Hope it helped you