JEE Main 2026 · 4 Apr · Shift 2 · Physics Q41

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PhysicsSingle correct+4 / -1Question 41 of 75

A convex lens is made from glass material having refractive index of 1.4 with same radius of curvature on both sides. The ratio of its focal length and radius of curvature is ________.

0.5

2.5

0.8

1.25

Answer and worked solution

Official answer: D

Lens-maker (equiconvex). $\dfrac1f=(1.4-1)\dfrac2R=\dfrac{0.8}R$ , so $\dfrac fR=1.25$ .

(D)

Topics:Thin lenses and lens maker's formula

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JEE Main 2026 · 4 Apr · Shift 2, Physics question 41