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Q.

Figure shows a concave convex lens having radii of curvature R( convex side) and 2R (concave side). A parallel beam of light is incident on the lens the beam becomes parallel again. Then select the correct option

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a

μ2=2μ1−μ3

b

μ2=2μ3−μ1

c

μ2=μ1+μ32

d

μ2=μ1−μ32

answer is A.

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Detailed Solution

μ3V−μ1(−U)=μ2−μ1(+R)−μ2−μ3(+2R)For parallel incident and emergent beams, U=∞ and V=∞∴ μ2−μ1R−μ2−μ32R=0⇒μ2=(2μ1−μ3)
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