defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Physics Optics Refraction and Reflection
The radius of curvature of a convex lens is 50 cm for both the surfaces. If the refractive index of the lens is 1.6, the focal length will be:
1
140 cm
2
160 cm
3
41.67 cm
4
150 cm