Q.

An equiconvex lens of focal length 20 cm having a glass of refractive index 3/2 is used in a medium air on left side and another medium having refractive index   on a right side of lens as shown in figure. (Light is incident from the left.)
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a

Focal length of lens will be 40 cm for  μ=4 and character will be diverging

b

Object distance and image distance with respect to lens will be same for  μ=2

c

Character of lens will be diverging  μ>2

d

Character of lens can’t be explained 

answer is A, B.

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Detailed Solution

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μ3Vμ1U=μ3μ2R2+μ2μ1R1

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