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KEAM 2013 Physics and Chemistry Paper
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© examsnet.com
Question : 58
Total: 120
The angle of incidence for an equilateral prism of refractive index
√
3
so that the ray is parallel to the base inside the prism is
30°
20°
60°
45°
75°
Validate
Solution:
Given,
µ
=
√
3
Here,
r
=
A
2
=
60
∘
2
=
30
∘
( ∵ equilateral prism)
So,
sin
i
sin
r
=
µ
sin
i
=
√
3
sin
30
∘
sin
i
=
√
3
×
1
2
sin
i
=
√
3
2
i
=
sin
−
1
(
√
3
2
)
i
=
60
∘
© examsnet.com
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