A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.

Answer

C

Explanation

1/v_A+1/mu_A=1/f`
`rarr 1/v_A+1/10=1/6`
1/v_A=1/6-1/410=1/15`
`=v_A=15 cm`
`1/v_B+1/12=1/6 rarr v_B=62cm`
Length of image `=v_A-v_B=15-12=3cm`