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Physics · 2013
JEE Main 2013 · 2013-04-07 Offline · Q60
Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 10^8 m / s, the focal…
Diameter of a plano - convex lens is $\displaystyle 6$ cm and thickness at the centre is $\displaystyle 3$ mm . If speed of light in material of lens is $\displaystyle 2 \times 10^8 \mathrm{~m} / \mathrm{s}$, the focal length of the lens is :
Official answer
(4)
$\displaystyle 30$ cm
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.