Q16. For the thin convex lens, the radii of curvature are at 15 cm and 30 cm respectively. The focal length the lens is 20 cm . The refractive index of the material is : (1) 1.2 (2) 1.8 (3) 1.5 (4) 1.4
Q16. For the thin convex lens, the radii of curvature are at 15 cm and 30 cm respectively. The focal length the lens is 20 cm . The refractive index of the material is :\\
(1) 1.2\\
(2) 1.8\\
(3) 1.5\\
(4) 1.4