The radius of curvature of the curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be,
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm
Answer:B
The radius of curvature of the curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be,
A. 5 cm B. 10 cm C. 15 cm D. 20 cm