Question

9. Aray of light is incident on oil - glass interface as shown in the figure below. Determine the value
of angle r. (Take refractive index of glass and oil as and respectively).
(3 marks)
30
Oil
Glass
S3
2730
쭻
2​

Answer 1

Answer:

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Answer 2

Answer:

Applying Snell's law at glass-water surface,

g

w

μ=

sini

sinr

=

w

μ

g

μ

...(i)

Applying Snell's law at water-air surface,

w

a

μ=

sinr

sin90

∘

=

a

μ

w

μ

...(ii)

Multiplying (i) and (ii),

a

μ

g

μ

=

sini

1

⇒

g

μ=

sini

1

.