Consider the following statements about a microscope and a telescope 1 Both the eyepiece and the obj...........

General Science (NDA) Physics

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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 larger than the focal length of its eyepiece

3. The magnification of a telescope increases with the increase in focal length of its objective.

Which of the statements given above are correct?

1 and 3 only

1 and 4

2, 3 and 4

1, 2 and 3

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 ofa telescope is larger than the focal length of its eyepiece. The magnification 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 increase in focal length of its objective.