The refractive index of the material of a prism is and the angle of the prism is $$30^\circ.$$ One of the two refracting surfaces of the prism is made a mirror inwards with a silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if the angle of incidence on the prism is:

 1 $$60^\circ$$ 2 $$45^\circ$$ 3 $$30^\circ$$ 4 zero
Subtopic:  Prisms |
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From NCERT
NEET - 2018
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A thin prism having refracting angle $$10^\circ$$ is made of glass of a refractive index $$1.42$$. This prism is combined with another thin prism of glass with a refractive index $$1.7$$. This combination produces dispersion without deviation. The refracting angle of the second prism should be:
1. $$6^{\circ}$$
2. $$8^{\circ}$$
3. $$10^{\circ}$$
4. $$4^{\circ}$$

Subtopic:  Prisms |
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From NCERT
NEET - 2017
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The angle of incidence for a ray of light at a refracting surface of a prism is 45°. The angle of prism is 60°. If the ray suffers minimum deviation through the prism, the angle of deviation and refracting index of the material of the prism respectively are

(a)30°,$\sqrt{2}$

(b)45°,$\sqrt{2}$

(c)30°,$\frac{1}{\sqrt{2}}$

(d)45°,$\frac{1}{\sqrt{2}}$

Subtopic:  Prisms |
72%
From NCERT
NEET - 2016
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The angle of incidence for a ray of light at a refracting surface of a prism is $$45^{\circ}$$. The angle of the prism is $$60^{\circ}$$. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:
 1 $$45^{0},~\sqrt{2}$$ 2 $$30^{0},~\sqrt{2}$$ 3 $$30^{0},~\frac{1}{\sqrt{2}}$$ 4 $$45^{0},~\frac{1}{\sqrt{2}}$$
Subtopic:  Prisms |
79%
From NCERT
NEET - 2016
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