defence exam Army Havildar SAC Mock Test Series 2025 Physics Optics Refraction and Reflection

The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. If focal length of the lens is 36 cm, find the refractive index of the material of the lens?

1
1.33 
2
1.2 
3
1.5 
4
1.7 
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