Minimum Deviation

Q. A ray of light incident on a ${60}^{\circ }$ angled prism of refractive index $\sqrt{2}$ suffers minimum deviation. Angle of incidence is

1. ${70}^{\circ }$
2. $0^{\circ }$
3. ${45}^{\circ }$
4. ${30}^{\circ }$

Q. Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is $(cos{41}^{\circ }=0.75)$

1. ${62}^{\circ }$
2. ${41}^{\circ }$
3. ${82}^{\circ }$
4. ${31}^{\circ }$

Q. A ray of light incident on a ${60}^{\circ }$ angled prism of refractive index $\sqrt{2}$ suffers minimum deviation. Angle of incidence is

1. ${70}^{\circ }$
2. $0^{\circ }$
3. ${45}^{\circ }$
4. ${30}^{\circ }$

Q. The refracting angle of prism is A and refractive index of material of prism is cot $\frac{A}{2}$ The angle of minimum deviation is

1. ${180}^{\circ }-3A$
2. ${180}^{\circ }+2A$
3. ${90}^{\circ }-A$
4. ${180}^{\circ }-2A$

Q. When a glass prism of refracting angle ${60}^{\circ }$ is immersed in a liquid, its angle of minimum deviation is ${30}^{\circ }$. The critical angle of glass with respect to the liquid medium is

1. ${30}^{\circ }$
2. ${45}^{\circ }$
3. ${60}^{\circ }$
4. ${50}^{\circ }$

Q. The angle of minimum deviation for prism angle $\frac{\pi }{3}$ is $\frac{\pi }{6}$. Calculate the velocity in the material of the prism, if the velocity of light in vacuum is $3.00\times {10}^{8}m{s}^{-1}$.

1. $2.12\times {10}^{8}m{s}^{-1}$
2. $2.50\times {10}^{8}m{s}^{-1}$
3. $3.00\times {10}^{8}m{s}^{-1}$
4. $3.50\times {10}^{8}m{s}^{-1}$

Q. The angle of minimum deviation for prism angle $\frac{\pi }{3}$ is $\frac{\pi }{6}$. Calculate the velocity in the material of the prism, if the velocity of light in vacuum is $3.00\times {10}^{8}m{s}^{-1}$.

1. $2.12\times {10}^{8}m{s}^{-1}$
2. $2.50\times {10}^{8}m{s}^{-1}$
3. $3.00\times {10}^{8}m{s}^{-1}$
4. $3.50\times {10}^{8}m{s}^{-1}$

Q. The refracting angle of prism is A and refractive index of material of prism is cot $\frac{A}{2}$ The angle of minimum deviation is

1. ${180}^{\circ }-3A$
2. ${180}^{\circ }+2A$
3. ${90}^{\circ }-A$
4. ${180}^{\circ }-2A$

Q. Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is $(cos{41}^{\circ }=0.75)$

1. ${62}^{\circ }$
2. ${41}^{\circ }$
3. ${82}^{\circ }$
4. ${31}^{\circ }$

Q. An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation

(IIT-JEE 2004)

1. PQ is horizontal
2. QR is horizontal
3. RS is horizontal
4. Any one will be horizontal

Q. When light rays are incident on a prism at an angle of ${45}^{\circ }$, the minimum deviation is obtained. If refractive index of the material of prism is $\sqrt{2}$ then the angle of prism will be ​

1. ${30}^{\circ }$
2. ${40}^{\circ }$
3. ${50}^{\circ }$
4. ${60}^{\circ }$

Q.

Colored light is an incident on a prism. If the refractive index for given color of light is $\sqrt{3}$ and the angle of the prism is $60°$, the angle of minimum deviation is _________.

1. $60°$

2. $30°$

3. $45°$

4. $15°$

Q. The angle of minimum deviation from a prism is ${37}^{\circ }.$ If the angle of prism is ${53}^{\circ },$ the refractive index of the material of the prism is

1. 1.72
2. 1.58
3. 1.63
4. 1.95

Q. Angle of glass prism is ${60}^{\circ }$ and refractive index of the material of the prism is 1.414, then what will be the angle of incidence, so that ray should pass symmetrically through prism

1. ${38}^{\circ }{61}^{\prime }$
2. ${35}^{\circ }{35}^{\prime }$
3. ${45}^{\circ }$
4. ${53}^{\circ }{8}^{\prime }$