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Mirror and lens Concave mirror and Convex mirror A concave mirror reflects light from sunken side and a convex mirror reflects light from the surface which is bulged out. In both the mirrors, f = R/2 and i/f = 1/v+1/u, Where u = distance of object from the pole of mirror, v = distance of image from pole of mirror, f =principle focal length of mirror = distance of principal focus F from pole P. R= radius of curvature of mirror = distance of centre of curvature C from pole P. The new Cartesian sign conventions are: 1) All distances are measured from pole of mirror, 2) The distance measured in the direction of incidence of light is taken as positive and vice-versa. For a convex mirror, f and R are positive. For a concave mirror, f and R are negative. Concave mirror and Convex mirror Lens A lens is a piece of transparent refracting material, which is bounded by two spherical surfaces or by one spherical surface and one plane surface. Two main types of lenses are...