A magnifying glass forms :

1. a real and diminished image
2. a real and magnified image
3. a virtual and magnified image
4. a virtual and diminished image

The maximum magnifying power of a convex lens of focal length 5 cm can be :

1. 25
2. 10
3. 1
4. 6

A simple microscope uses a :

1. convex lens of short focal length
2. convex lens of large focal length
3. concave lens of short focal length
4. concave lens of large focal length

Magnifying power of a microscope is given as :

1. M = f + D
2. M = $\dfrac{D}{f}$
3. M = f + $\dfrac{1}{D}$
4. M = 1 + $\dfrac{D}{f}$