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

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is True

Answer

B

Explanation

For normal adjustment, a 30 cm lens final image cannot form image at the near point (25 cm from the eye). So the statement is true. For image at infinity, angular magnification of simple microscope is given by `M = D//f`.
So, the reason is also true. But reason does not explain the assertion.