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NEET Physics : Ray Optics and Optical Instruments

Multiple Choice Questions

141.

A prism of refractive index √2 has a refracting angle of 60°. At what angle a ray must be incident on it so that it suffers a minimum deviation?

45°
60°
90°
180°

142.

The radius of the convex surface of the plano-convex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length is :

30 cm
50 cm
20 cm
40 cm

143.

The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of θ for the following refraction?

$sinθ \geq \frac{13}{11}$
$sinθ \geq \frac{11}{13}$
$sinθ \geq \frac{\sqrt{3}}{2}$
$sinθ \geq \frac{1}{\sqrt{2}}$

144.

The deviation is maximum for which colour :

Violet
Red
Blue
Green

145.

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is :

3 × 10⁸ m/s
1.5 × 10⁸ m/s
6 × 10⁸ m/s
$\sqrt{3}$ × 10⁸ m/s

146.

A light wave travels from glass to water. The refractive indices for glass and water are $\frac{3}{2}$ and $\frac{4}{3}$ respectively. The value of the critical angle will be :

$\sin^{- 1} (\frac{1}{2})$
$\sin^{- 1} (\frac{9}{8})$
$\sin^{- 1} (\frac{8}{9})$
$\sin^{- 1} (\frac{5}{7})$

147.

For a telescope, larger be the diameter of the objective lens:

greater the resolving power
smaller is the resolving power
greater is the magnifying power
smaller is the magnifying power

148.

A person who can see things most clearly at a distance of 10 cm, requires spectacles to enable to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles?

15 cm (concave)
15 cm (convex)
10 cm (concave)
0

149.

In the given figure, what is the angle of the prism?

150.

A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth, when viewed through one face, is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is:

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NEET Physics : Ray Optics and Optical Instruments

Multiple Choice Questions