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 \[\frac{d}{4}\]
Correct Answer: B
Solution :
The lens formula can be written as \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}....(i)\] Given, v = d For equal size image |v| = |u| = d By sign convention, u = -d \[\therefore \frac{1}{f}=\frac{1}{d}+\frac{1}{d}\] \[orf=\frac{d}{2}\]You need to login to perform this action.
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