Question

Assertion(A):

A convex lens of focal length 30 cm can't be used as a simple microscope

in normal setting.

Reason (R):

For normal setting, the angular magnification of simple microscope is M=D/f​

Answer 1

Answer:

SWER

The least distance of vision is D=25cm

The magnification ratio of simple microscope m=1+

f

D

5=1+

f

25

So f=6.25cm is th e focal length of lens.

Answered By

toppr

Answer 2

A convex lens of focal length 30 cm can't be used as a simple microscope in normal setting. Reason (R): For normal setting, the angular magnification of simple microscope is M=D/f.

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