Magnifying power of a simple microscope is (when final image is formed, at D=25cm from eye)A. `(D)/(f)`B. `1 + (D)/(f)`C. `1 + (f)/(D)`D. `1 -(D)/(f)`

Magnifying power of a simple microscope is (when final image is formed

1.	Magnifying power of a simple microscope is (when final image is formed, at D=25cm from eye)A. `(D)/(f)`B. `1 + (D)/(f)`C. `1 + (f)/(D)`D. `1 -(D)/(f)`
Answer» Correct Answer - B When final image is formed at D = 25 cm from eye. In this situation, `v=-D` from lens formula, `(1)/(v)-(1)/(u)=(1)/(f)`, we have, `(1)/(-D)-(1)/(-u)=(1)/(f)` i.e., `(D)/(u)=1+(D)/(f)` So, Magnifying power `=(D)/(u)=(1+(D)/(f))`

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Magnifying power of a simple microscope is (when final image is formed, at D=25cm from eye)A. `(D)/(f)`B. `1 + (D)/(f)`C. `1 + (f)/(D)`D. `1 -(D)/(f)`

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