Q. A container is filled with water ( = 1.33) upto height of 33.25 cm and a concave minor is placed 15 cm. above the water level . The image of an object placed at the bottom is formed 25 cm below the water level. The focal length of concave mirror is approximately .........
(A) 10 (B) 15 (C) -20 (D) - 23
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