question_answer

A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image                                               [MP PMT 1995]

A)            5 mm                                       

B)            1 mm

C)            0.5 mm                                   

D)            0.1 mm

Correct Answer: C

Solution :

                   Size of image = fq =\[0.5\times (1\times {{10}^{-3}})\]= 0.5 mm