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(b) 10cm
(c) Diopter
(c) At infinity
(c) Atmospheric refraction
(b) Optically denser
(c) Between P and F
(c) -0.25m
(c) At C
(c) Virtual and erect
(a) At infinity
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 lessA concave mirror gives virtual, erect and enlarged image of the object. The position of the object is
(c) Between P and F
(c) Between P and F
See lessPower of the lens is-40, its focal length is
(c) -0.25m
(c) -0.25m
See lessA concave mirror gives real, inverted and same size image if the object is placed
(c) At C
(c) At C
See lessImage formed by plane mirror is
(c) Virtual and erect
(c) Virtual and erect
See lessFocal length of plane mirror is
(a) At infinity
(a) At infinity
See less