Question

1. design a compound microscope of 900 overall magnification based on DIN standard.

2. Prove that the magnification of a telescope is determined by the ratio of the focal length of its objective lens over the focal length of its eyepiece.

Answer 1

Ans: A compound microscope is made up of two or more convex lenses and has one object lens and one or more eye pieces.

For two lens compound microscope the overall magnification is given by

m = m_o x m_e

m_o and m_e are magnifications of object and eye pieces respectively and m_o > m_e.

Given m = 900 and let m_o = 300 then m_e = 3