A convex lens of focal length 10 cm and a concave lens of same focal length in value are placed co-axially at a separation of 20 cm as shown in figure. A point object is at infinity on the principal axis. Take the optic center of convex lens as origin of co-ordinate system and the principal axis as x-axis as shown in figure.In the initial position (as given in the passage) if the concave lens has a velocity of 9 cm/s towards the convex lens, the velocity of the final image will be

A convex lens of focal length 10 cm and a concave lens of same focal l

1.	A convex lens of focal length 10 cm and a concave lens of same focal length in value are placed co-axially at a separation of 20 cm as shown in figure. A point object is at infinity on the principal axis. Take the optic center of convex lens as origin of co-ordinate system and the principal axis as x-axis as shown in figure.In the initial position (as given in the passage) if the concave lens has a velocity of 9 cm/s towards the convex lens, the velocity of the final image will be
Answer» 10 cm/s along POSITIVE x-axis 6.75 cm/s along NEGATIVE x-axis 8 cm/s along negative x-axis 8 cm/s along positive x-axis ANSWER :B

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