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A converging beam of light rays passes t...

A converging beam of light rays passes through a round opening in a screen. The beam converges at a point A which is at a perpendicular distance of 15 cm from the screen and lies slightly above the central axis of the circular opening. A convex lens of focal length 30 cm is inserted in the opening. At what distance from the screen do the rays converge now ?

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The correct Answer is:
10cm
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