A) 3.5
B) 2.5
C) 1.5
D) 1.4
Correct Answer: A
Solution :
The converging lens used for magnification is called simple microscope or a magnifier. When image is formed at D, the least distance of distinct vision, then magnifying power \[M=1+\frac{D}{f}\] Given, \[D=25\,cm,\,f=10\,cm\] \[\therefore \] \[M=1+\frac{25}{10}=1+2.53=3.5\] Note : When image is formed at infinity,\[M=\frac{D}{f}\]. This relation is called magnifying power for normal adjustment.
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