A telescope has magnification 5 and length of tube 60cm then the focal length of eye piece is–

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

The objective of a small telescope has focal length 120 cm and diameter 5 cm. The focal length of the eye piece is 2 cm. The magnifying power of the telescope for distant object is -

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20cm. Then the focal length of the eye - piece is

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20cm. Then the focal length of the eye - piece is

The focal length of the objective lens of a telescope is 50 cm If the magnification of the telescope is 25, then the focal length of the eye-piece is

The minimum magnification is 10 and maximum tube length of an Astronomical telescope is 55 cm. The focal length of objective (f_0) and the focal. Length of eyepiece (f_e) are