An amateur reflecting telescope uses a concave primary mirror of focal length and a…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
An amateur reflecting telescope uses a concave primary mirror of focal length fo=80cm and a convex eyepiece lens of focal length fe=2cm. The telescope is adjusted so that the final image is at infinity for a relaxed eye.
(a) Calculate the separation between the primary mirror and the eyepiece.
(b) Determine the magnifying power of the telescope under this adjustment.
(c) The Moon subtends an angle of 0.5∘ at the unaided eye. What angular diameter will the Moon appear to have when observed through this telescope?