focal length of a concave mirror is 20 CM.if an object is placed at following distance from the pole of the mirror in front of this mirror write the nature of the image formed. (a) at 16 (b)20 CM (c) 30cm (d) 40cm (e) 50cm . pls help me
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When an object is kept at a distance of 20 cm from a concave mirror, the image is formed at a distance of 10 cm. If the object is moved with a speed of 4 m/s, the speed with which the image moves is us-20 (A) 10 cm/sec (B) 1 m/sec (C) 4 m/sec (D) 0.4 m/sec.
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