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An object is placed 40 cm from the conca...

An object is placed 40 cm from the concave mirror with a focal length of 20 cm. The image formed is:

A

behind the mirror

B

between the mirror and focus

C

at focus

D

centre of curvature of mirror

Text Solution

Verified by Experts

The correct Answer is:
D
Given focal length of concave mirror, f = 20 cm
Distance of object from concave mirror
r = - 40 cm
From the mirror formula `rArr (1)/(-40) + (1)/(v) = (1)/(-20)`
`(1)/(v) = (1)/(-20) + (1)/(40)`
`= (- 2 + 1)/( 40)`
`= (-1)/( 40)`
v = - 40
Hence image is formed at the centre of carvature of the mirror
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