A beam of light consisting of red, green, and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the red, green, and blue wavelengths is $$1.39$$, $$1.44$$, and $$1.47$$ respectively.

The prism will:

 1 separate the blue colour part from the red and green colour 2 separate all the three colours from one another 3 not separate the three colours at all 4 separate the red colour part from the green and blue colours
Subtopic: Â Prisms |
Â 62%
From NCERT
NEET - 2015
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The refracting angle of a prism is $$A,$$ and the refractive index of the material of the prism is $$\text{cot} \frac{A}{2}.$$ The angle of minimum deviation is:
 1 $$180^\circ-3A$$ 2 $$180^\circ-2A$$ 3 $$90^\circ-A$$ 4 $$180^\circ+2A$$
Subtopic: Â Prisms |
Â 81%
From NCERT
NEET - 2015
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The angle of a prism is $$A$$. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence $$2{A}$$ on the first surface return back through the same path after suffering reflection at the silvered surface. The refractive index $$\mu,$$ of the prism, is:
1. $$2\text{sin}A$$
2. $$2\text{cos}A$$
3. $$\frac{1}{2}\text{cos}A$$
4. $$\text{tan}A$$

Subtopic: Â Prisms |
Â 76%
From NCERT
AIPMT - 2014
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A ray of light is incident at an angle of incidence, $$i$$, on one face of a prism of angle $$A$$ (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $$\mu,$$ the angle of incidence $$i$$, is nearly equal to:
1. $$\mu A$$
2. $$\frac{\mu A}{2}$$
3. $$\frac{A}{\mu}$$
4. $$\frac{A}{2\mu}$$

Subtopic: Â Prisms |
Â 78%
From NCERT
AIPMT - 2012
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For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index:

 1 lies between $$2$$ and $$\sqrt{2}$$ 2 is less than $$1$$ 3 is greater than $$2$$ 4 lies between $$\sqrt{2}$$ and $$1$$

Subtopic: Â Prisms |
Â 58%
From NCERT
AIPMT - 2012
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A thin prism of angle $$15^\circ$$ made of glass of refractive index $$\mu_1=1.5$$ is combined with another prism of the glass of refractive index $$\mu_1=1.75.$$ The combination of the prism produced dispersion without deviation. The angle of the second prism should be:
1. $$5^\circ$$
2. $$7^\circ$$
3. $$10^\circ$$
4. $$12^\circ$$

Subtopic: Â Prisms |
Â 82%
From NCERT
AIPMT - 2011
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A ray of light is incident on a $$60^\circ$$ prism at the minimum deviation position. The angle of refraction at the first face (i.e. incident face) of the prism is:
1. $$30^\circ$$
2. $$45^\circ$$
3. $$60^\circ$$
4. zero

Subtopic: Â Prisms |
Â 73%
From NCERT
AIPMT - 2010
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