Angular Magnification: Image at Near Point

Q. A compound microscope has a magnifying power 30. The focal length of its eye-piece is 5 cm. Assuming the final image to be at the least distance of distinct vision. The magnification produced by the objective will be

1. 5
2. -5
3. 6
4. -6

Q.

The magnifying power of a simple microscope when the final image is formed at D = 25 cm from eye is :(f is the focal length)

1. 
2. 
3. 
4. 

Q. What will happen if in a compound microscope, the objective lens is larger in size and has a larger focal length?