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A spherical mirror forms an image of mag...

A spherical mirror forms an image of magnification3. The object distance, if focal length of mirror is 24cm, may be

A

32cm, 24cm

B

32cm, 16cm

C

32cm only

D

16cm only

Text Solution

Verified by Experts

The correct Answer is:
b.
`m=(f)/(f-u)`
`3=(-24)/(-24-u)`
or `-24-u=-8 or u+24=8`
or `u=(8-24)cm=-16cm`
If `m=-3,` then
`-3=(-24)/(-24-u)`
`u+24=-8`
or `u=-32cm`.
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