A) convex, 9 cm
B) concave, 9 cm
C) convex, 25 cm
D) concave, 25 cm
Correct Answer: A
Solution :
Condition for achromatic combination \[r=\frac{10}{2}=5cm=5\times {{10}^{-2}}m\] \[R=5\Omega \] \[H=0.314\] \[H=\frac{{{\mu }_{0}}}{4\pi }\frac{2\pi ni}{r}\] Focal length is positive, so it is convex.
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