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A convergent beam of light converges to ...

A convergent beam of light converges to a point `20 cm` behind the convex mirror on the principal axis. An inverted image of the same size is formed coincident with the virtual object. Then, the focal length of the convex mirror is

A

`20 cm`

B

`10 cm`

C

`40 cm`

D

`30 cm`

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(20)+(1)/(20)=(1)/(f)` or`(1)/(f)=(1)/(10)` or`f=10cm`.
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A2Z-GEOMETRICAL OPTICS-Section D - Chapter End Test
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