CUET and UG exam CUET UG 2025 Mock Test Series Physics Optics Refraction and Reflection

A thin double convex lens has surfaces of radii of curvature 25 cm each. If the focal length of the lens is 20 cm, then the refractive index of the material of the lens is -

1
1.50
2
1.33
3
1.625
4
1.575
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