Physics · 2013
NEET 2013 · 5 May · Code W · Q39
A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different…
A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $\displaystyle \mu_1$ and $\displaystyle \mu_2$ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is :
Official answer
(3)
$\displaystyle \frac{R}{\left(\mu_1-\mu_2\right)}$
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NEET (UG) 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.