A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

Options

A. infinity
B. pole
C. focus
D. 15 cm behind the mirror

Answer

D

Explanation

Given, `u=-30 cm` f = 30 cm
`(1)/(v)+(1)/(-30)=(1)/(30)rArr (1)/(v)=(1)/(30)+(1)/(30)=(1)/(15)`
`therefore " "` Distance from the mirror, `v=+15 cm`