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QAIPM-2002-Ph-2839: NEET 2002 Physics - Class 12 AIPM-2002-Ph-2839 Solution: A bulb is located on a wall. Its image is to be obtained on a…

A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. The lens is placed at a distance d ahead of second wall, then required focal length will be

Multiple Choice Options

A only $\frac{d}{4}$
B only $\frac{d}{2}$
C more than $\frac{d}{4}$ but less than $\frac{d}{2}$
D less than $\frac{d}{4}$

Step-by-Step Verified Solution

Using the lens formula 1 f = 1 v _ 1 u Given v = d, for equal size image |v| = |u| = d By sign convention u = -d _ 1 f = 1 d _ 1 _ d _ f = d 2

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