Consider the following statements about a microscope and a
telescope
1. Both the eyepiece and the objective of a microscope
are convex lenses.
2. The focal length of the objective of a telescope is
lerger than the focal length of its eyepiece.
3. The magnification of a telescope increases with the
increases in focal length of its objective.
4. The magnification of a microscope increases with the
increases in focal length of its objective.
Which of the statements given above are correct?

Options

A. a 1 and 3 only
B. b 1 and 4
C. c 2, 3, and 4
D. d 1,2 and 3

Answer

D

Explanation

In case of compound microscope both the eyepiece
and the objective of are made up of convex lenses.
The focal length of the objective of a telecope is larger
than the focal length of its eyepiece.
The magnigication of a telescope increases with the
increase in focal length of its objective since `m=f_(o)//f_(e)`
while the magnification of microscope decreases with ltbr. increases in focal lenght of its objective.