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

1. on f but not on u

2. on u but not on f

3. on f as well as u

4. neither on f nor on u

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 5X before his eyes. The angular magnification achieved is

1. 5

2. 2.5

3. 1

4. 0.2

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 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)