A ray of light is incident on the interface between water and glass at an angle `i` and refracted parallel to the water surface, then value of `mu_(g)` will be

Options

A. `(4//3)sini`
B. `1/(sin i)`
C. `4/3`
D. `1`

Explanation

(b) `._(g)mu_(w)=(sin i )/(sin r)`
`._mu_(a)=(sin r)/(sin 90^(@))`
`implies ._(g)mu_(w)xx._(w)mu_(a)=(sin i)/(sin r)=(sin r)/(sin 90^(@))=sini`
or `(mu_(w))/(mu_(g))xx(mu_(a))/(mu_(w))=sin i impliesmu_(g)=1/(sin i)`