A beam of light of wavelength 6400 Å is ...

A beam of light of wavelength 6400 Å is incident normally on a parallel glass plate of 5cm thick and R.I. 1.6. The beam takes the same time to travel from source to incident surface and through the glass plate. The distance of source from incident surface is

7.5 cm

6 cm

10 cm

8 cm

Text Solution

Verified by Experts

The correct Answer is:

`t_(a) = t_(g)`
`(d_(a))/(v_(a)) = (d_(g))/(v_(g))`
`d_(a) = (v_(a))/(v_(g)) d_(g) = mu_(g)d_(g) = 1.6 xx 5 = 8 cm`

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