Two convex lenses of focal lengths f1 and f2 form images with magnification m1 and m2, when used individually for an object kept at the same distance from the lenses. Then f1/f2 is:
A
m1(1+m2)m2(1+m2)
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B
m1(1+m2)m2(1+m1)
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C
m2(1+m1)m1(1+m2)
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D
m2(1+m2)m1(1+m1)
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Solution
The correct option is Am1(1+m2)m2(1+m1) Len's formula with magnification is: 1+m1m1=−uf11+m2m2=−uf2⇒1+m2m21+m1m1=f1f2=m1m2(1+m21+m1)