A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with $\mu = 1.65.\ $The focal length of the lens in nearly

Question

Dr. Abubacker · Accepted Answer

(b) $\frac{1}{f} = (1.65 - 1)\left( \frac{2}{40} \right)$
Or $\ \frac{1}{f} = \frac{0.65}{20}$
Or $f = \frac{20}{0.65}cm$
$= 30.77\ cm \approx 31\ cm$

Q. A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with $\mu = 1.65.\ $The focal length of the lens in nearly

Explanation

Reviewed by Dr. Abubacker

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