Exercise#1

The resolving power of a telescope is more when its objective lens has

A Galileo telescope has an objective of focal length $100 \mathrm{cm}$ and magnifying power $50$. The distance between the two lenses in normal adjustment will be

The convex lens is used in-

The magnifying power of a simple microscope can be increased if an eyepiece of:

The focal length of the objective of a microscope is

Resolving power of a microscope depends upon

An astronomical telescope has an eyepiece of focal-length $5 \mathrm{cm}$. If the angular magnification in normal adjustment is $10,$ when final image is at least distance of distinct vision $\left(25 \mathrm{cm}\right)$ from eye piece, then angular magnification will be :

A person with a defective sight is using a lens having a power of $+2 \mathrm{D}$. The lens he is using is