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Question

The linear magnification for a mirror is the ratio of the size of the image to the size of the object, and is denoted by m. Then m is equal to (symbols have their ususal meanings)ufu−fu+fu−fff−uf+uu−f

A
ufuf
B
u+fuf
C
ffu
D
f+uuf
Solution
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m=h1h0=−vu......(i)From mirror formula1f=1v+1u........(ii)Multiplying equation (ii) by u, we getuf=uv+1 or uv=uf−1=u−ffor vu or m=−vu=−fu−f=ff−u

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