The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is

1. always strained in looking at an object

2. strained for objects at larger distances only

3. strained for objects at short distances only

4. unstrained for all distances

Mark the correct options.

(a) If the far point goes ahead, the power of the divergent lens should be reduced

(b) If the near point goes ahead, the power of the convergent lens should be reduced

(c) If the far point is 1m away from the eye, divergent lens should be used

(d) If the near point is 1m away from the eye, divergent lens should be used

1. (a) and (b)

2. (b) and (c)

3. (a) and (c)

4. (c) and (d)

The focal length of the objective of a compound microscope is f₀ and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument,

(a) L < u

(b) L > u

(c) f₀ < L < 2f₀

(d) L > 2f₀

Choose the correct option:

1. (a) and (b)

2. (b) and (d)

3. (b) and (c)

4. (c) and (d)

The angular dispersion produced by a prism:

If a glass prism is dipped in water, its dispersive power

1. increases

2. decreases

3. does not change

4. may increase or decrease depending on whether the angle of the prism is less than or greater than 60°

A prism can produce a minimum deviation \(\delta\) in a light beam. If three such prisms are combined, the minimum deviation that can be produced in this beam is

1. 0

2. \(\delta\)

3. 2\(\delta\)

4. 3\(\delta\)

Consider the following two statements:

(A) Line spectra contain information about atoms.
(B) Band spectra contain information about molecules.

1. Both A and B are wrong

2. A is correct but B is wrong

3. B is correct but A is wrong

4. Both A and B are correct

The focal length of a converging lens are f_v and f_r for violet and red light respectively.

1. f_v > f_r

2. f_v = f_r

3. f_v < f_r

4. Any of the three is possible depending on the value of the average refractive index \(\mu\)

A narrow beam of white light goes through a slab having parallel faces.

(a) The light never splits in different colours

(b) The emergent beam is white

(c) The light inside the slab is split into different colours

(d) The light inside the slab is white

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

By properly combining two prisms made of different materials, it is possible to

(a) have dispersion without average deviation

(b) have deviation without dispersion

(c) have both dispersion and average deviation

(d) have neither dispersion nor average deviation

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (a), (b) and (c)

3. (b), (c) and (d)