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

JEE PHYSICS MCQ: RAY OPTICS

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Application +4 | -1

A thin double convex lens has radii of curvature each of magnitude

\mathrm{40}\,\,\mathrm{cm}

and is made of glass with

\mu = 1.65

. The focal length of the lens in nearly

View answer and explanation

Correct option: B

\mathrm{31}\,\,\mathrm{cm}

Option B (

\mathrm{31}\,\mathrm{cm}

) is correct because the focal length is calculated using the lens maker's formula with the given refractive index and radii of curvature.

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