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20 A luminous point object is moving along the principal axis of a concave mirror...

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20 A luminous point object is moving along the principal axis of a concave mirror of focal length 12 cm towards it When its distance from mirror is 20 cm its velocity is 4 cm s The velocity of the image in cm s at that instant is a 6 cm s towards the mirror b 6 cm s away from the mirror c 9 cm s away from the mirror d 9 cm s towards the mirror c 1 0 24 How heig the t a 8 25 Mor

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