A reflecting type telescope has a concave reflector of radius of curvature `120 cm`. Calculate the focal length of eye piece tom secure a magnification of `15`.

A reflecting type telescope has a concave reflector of radius of curvature 120 cm.Calculate the focal length of eye-piece to secure a magnification of 20.

A reflecting type telescope has a concave reflector of radius of curvature 120 cm . Calculate focal length of eye piece to secure a magnification of 20 .

A reflecting type telescope has a concave reflector of radius of curvature 120 cm. Calculate focal length of eye piece to secure a magnification of 20.

A reflecting type telescope has a concave reflector radius of curvature 120 cm. Calculate the focal length of eyepiece to secure a magnification of 20 .

What is the focal length of a concave mirror of radius of curvature 16.0 cm?

The focal length of a concave mirror with radius of curvature 12 cm is

A reflecting type telescope has a large concave spherical mirror of radius of curvature 80 cm as objective. What is the magnifying power of telescope if eye piece used has a focal length of 1.6 cm ?

A reflecting type telescope has a large concave spherical mirror of radius of curvature 80 cm as objective. What is the magnifying power of telescope if eye piece used has a focal length of 1.6 cm ?

A telescope has a magnification equal to 5 and the length of its tube is 60 cm. The focal length of its eye piece is