Question

A ray of light travelling through air falls on the surface of a glass slab and emerges out of it parallel to the incident ray. The angle of incidence i, angle of refraction in glass r and angle of emergence is e. Find the ratio of
sin i/sin e and refractive index of glass in terms of e and r.

Answer 1

Explanation:

Since, μ=

speedoflightinmedium

speedoflightinvacuum

μ

g

=

2×10

8

3×10

8

=1.5

r=90−i

Hence from Snell's law,

μ

1

sini=μ

2

sinr

1sini=

2

3

sin(90−i)

tani=

2

3

i=tan

−1

(3/2)=56.30

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