Question

In an astronomical telescope the focal lengths of objective and eyepiece should respectively be :

• A. large and small
• B. small and large
• C. equal
• D. too small are too large

Answer 1

The correct option is A large and small

In an astronomical telescope, two convex lenses are used for different focal lengths. In which the lens with large focal length is an objective lens which is used to see large distance objects like stars or planets and the one with small focal is eyepiece. Hence correct option is A.