The angle of a prism is A and one of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface return through the same path after suffering reflection at the second (silvered) surface. The refractive index of the material is:

1.  2sinA

2.  2cosA

3.  $\frac{1}{2}$cosA

4.  tanA

Subtopic:  Prisms |
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The condition of minimum deviation is achieved in an equilateral prism kept on the prism table of a spectrometer. If the angle of incidence is 50$°$, the angle of deviation is:

1. 25$°$

2. 40$°$

3. 50$°$

4. 60$°$

Subtopic:  Prisms |
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A ray of light falls on a prism ABC (AB=BC) and travels as shown in figure. The refractive index of the prism material should be greater than:

1. 4/3

2. $\sqrt{2}$

3. 1.5

4. $\sqrt{3}$

Subtopic:  Prisms |
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The refractive index of the material of a prism is $\sqrt{2}$ and its refracting angle is 30º. One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is:

1. 60º

2. 0º

3. 30º

4. 45º

Subtopic:  Prisms |
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A ray of light is incident on an equilateral glass prism placed on a horizontal table as shown. For minimum deviation, a true statement is:

1.  PQ is horizontal

2.  QR is horizontal

3.  RS  is horizontal

4.  Either PQ or RS is horizontal

Subtopic:  Prisms |
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The angle of minimum deviation for a glass prism of refractive index  equals the refracting angle of the prism. The angle of the prism is:

1.  $30°$

2.  $60°$

3.  $90°$

4.  $45°$

Subtopic:  Prisms |
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The refracting angle of a prism is A, and refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is:

1. 180$°$-3A

2. 180$°$-2A

3. 90$°$-A

4. 180$°$+2A

Subtopic:  Prisms |
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The angle of incidence for a ray of light at a refracting surface of a prism is 45o. The angle of the prism is 60o. 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 |
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A graph is plotted between the angle of deviation $$\delta$$ in a triangular prism and the angle of incidence as shown in the figure. Refracting angle of the prism is:

1.  28$°$

2.  48$°$

3.  36$°$

4.  46$°$

Subtopic:  Prisms |
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If a light ray is incident normally on face AB of a prism, then for no emergent ray from second face AC:
[$\mu$$\to$refractive index of glass of prism]

1.  $\mu$ = $\frac{2}{\sqrt{3}}$

2.  $\mu$ > $\frac{2}{\sqrt{3}}$

3.  $\mu$ < $\frac{2}{\sqrt{3}}$

4.  $\mu$ can have any value.

Subtopic:  Prisms |
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