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A thin lens made of a material of refractive index \( \mu_{2} \) has a medium of refractive index \( \mu_{1} \) on one side and a
\( \mathrm{P} \) medium of refractive index \( \mu_{3} \) on the other side. The lens

W is biconvex and the two radii of curvature have equal magnitude \( R \). A beam of light travelling parallel to the principal axis is incident on the lens. Where will the image be formed if the beam is incident from (a) the medium \( \mu_{1} \) and (b) from the medium \( \mu_{3} \) ?
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