A) at distance \[\frac{R}{4}\]
B) at distance \[\frac{R}{2}\]
C) at distance R
D) in contact with each other
Correct Answer: C
Solution :
For plano-convex lens \[\frac{1}{f}=\frac{(\mu -1)}{R}\] \[=\frac{2\times {{10}^{-3}}\times {{45}^{o}}}{1}\] When placed in contact \[\frac{1}{F}=\frac{1}{f}+\frac{1}{f}=\frac{1}{2R}+\frac{1}{2R}=\frac{1}{R}\] \[\therefore \] \[f=R\]
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