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(b) 10cm
(c) Diopter
(c) At infinity
(c) Atmospheric refraction
(b) Optically denser
The radius of curvature of a mirror is 20cm the focal length is-
(b) 10cm
(b) 10cm
See lessThe unit of power of lens is
(c) Diopter
(c) Diopter
See lessConvex lens focus a real, point sized image at focus, the object is placed
(c) At infinity
(c) At infinity
See lessThe optical phenomena, twinkling of stars, is due to
(c) Atmospheric refraction
(c) Atmospheric refraction
See lessIn optics and object which has higher refractive index is called
(b) Optically denser
(b) Optically denser
See less