Q)
(chatquestion)...The diameter of aperture of a plano-convex lens is
6 cm and its maximum thickness is 3 mm. If the
velocity of light in the material of the lens is
2x 108 m/s, its focal length is (approximately)
(2) 15 cm
(1) 10 cm
(4) 60 cm
(3) 30 cm
...
