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An object is placed on the principal axis of a convex mirror. Distance of onject from the mirror is `40cm`. A plane mirror is placed between the object and the convex mirror, covering lower half below principal axis of the mirror. Distance between the object and the plane mirror is `30cm`. If there is no parallax between the two images formed by plane mirror and convex mirror, the focal length of the convex mirror is
A. `20cm`
B. `40cm`
C. `60cm`
D. `80cm`

1 Answer

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Best answer
Correct Answer - B
`u=-40cm`, `v=+20cm`
`(1)/(f)=(1)/(v)+(1)/(u)impliesf=40cm`
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