The distance of the eye lens from the retina is \(x.\) For a normal eye, the maximum focal length of the eye lens
1. \(=x\)
2. \(<x\)
3. \(>x\)
4. \(=2x\)

A man wearing glasses of focal length +1m cannot clearly see beyond 1 m

1. if he is farsighted

2. if he is nearsighted

3. if his vision is normal

4. in each of these cases

An object is placed at a distance \(u\) from a simple microscope of focal length \(f.\) The angular magnification obtained depends:

To increase the angular magnification of a simple microscope, one should increase:

A man is looking at a small object placed at his near point. Without alternating the position of his eye or the object, he puts a simple microscope of magnifying power \(5 \times\) before his eyes. The angular magnification achieved is:
1. \(5\)
2. \(2.5\)
3. \(1\)
4. \(0.2\)

When we see an object, the image formed on the retina is
(a) real
(b) virtual
(c) erect
(d) inverted

Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)

In which of the following the final image is erect?
(a) Simple microscope
(b) Compound microscope
(c) Astronomical telescope
(d) Galilean telescope

Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)

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

Choose the correct option:
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 \(f_0\) 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) \(f_0 < L < 2f_0\)
(d) \(L > 2f_0\)

Choose the correct option:
1. (a) and (b)
2. (b) and (d)
3. (b) and (c)
4. (c) and (d)