Dispersion through Prisms

Q. A thin prism $P_1$ with angle $4^{\circ }$ and made from glass of refractive index 1.54 is combined with another prism $P_2$Made of glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism $P_2$ is

1. ${5.33}^{\circ }$
2. $4^{\circ }$
3. $3^{\circ }$
4. ${2.6}^{\circ }$

Q.

The rays of different colours fail to converage at a point after going through a converging lens. This defect is called

1. spherical aberration

2. distortion

3. coma

4. chromatic aberration

Q. Prism angle of a prism is ${10}^{\circ }$. Refractive index for red and violet colour is 1.51 and 1.52 respectively. Then the dispersive power of the prism is

1. 0.019
2. 0.011
3. 1.515
4. 0.029

Q. Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10^o, then the angle of prism for crown prism will be

1. ${12}^{\circ }{2.4}^{\prime }$
2. ${12}^{\circ }{4}^{\prime }$
3. ${1.24}^{\circ }$
4. ${12}^{\circ }$

Q. A glass prism deviates the red and blue rays through ${10}^{\circ }$ and ${12}^{\circ }$ respectively. A second prism of equal angle deviates them through $8^{\circ }$ and ${10}^{\circ }$ respectively. Their dispersive powers are in the ratio

1. 11: 9
2. 9 :11
3. 3 : 2
4. 1 : 1

Q. The rays of different colours fail to converge at a point after going through a converging lens. This defect is called
(a) spherical aberration
(b) distortion
(c) coma
(d) chromatic aberration.

Q. Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10^o, then the angle of prism for crown prism will be

1. ${12}^{\circ }{2.4}^{\prime }$
2. ${12}^{\circ }{4}^{\prime }$
3. ${1.24}^{\circ }$
4. ${12}^{\circ }$