A plano convex lens \( (\mu=1.5) \) has maximum thickness of \( 1 \mathrm{~mm} \). If diameter o...

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A plano convex lens \( (\mu=1.5) \) has maximum thickness of \( 1 \mathrm{~mm} \). If diameter of its aperture is \( 4 \mathrm{~cm} \). Find
(i) Radius of curvature of curved surface.
(ii) Its focal length in air.
(a) \( 0.2 \mathrm{~m}, 0.4 \mathrm{~m} \)
(b) \( 0.2 \mathrm{~m}, 0.3 \mathrm{~m} \)
(c) \( 0.3 \mathrm{~m}, 0.4 \mathrm{~m} \)
(d) \( 0.2 \mathrm{~m}, 0.2 \mathrm{~m} \)
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