Q.

A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror, what is the size of image?

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a

fu-fb2

b

fu-f2b

c

fu+fb2

d

2fu-f2b

answer is B.

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Detailed Solution

1v+1u=1f1+1m=uf1m=uf-1=u-ff                   m=fu-f=vu-dvv2-duu2=0duu2=dvv2dv=v2u2du=fu-f2b
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A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror, what is the size of image?