A convex lens and concave mirror are placed with common principle axis. Separation between lens and mirror is 40 cm. A light point source S is placed on principle axis at a distance 30 cm from the lens as shown in figure. If reflected light beam comes parallel to principle axis, then magnitude of focal length of concave mirror is f= 15 cm ? (1) 20 cm (3) 30 cm 30 cm 40 cm (2) 10 cm (4) 25 cm

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