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Please help A bulb is hanging from a ceiling and the distance of the bulb from the floor is 1m. In between the bulb & the floor, we hold a convex lens such that it's image is formed on the floor. The lens is dropped and image is formed on the floor again after 0.2 sec. Find focal length of lens (in cm).

Please help
A bulb is hanging from a ceiling and the distance of the bulb from the floor is 1m. In between the bulb & the floor, we hold a convex lens such that it's image is formed on the floor. The lens is dropped and image is formed on the floor again after 0.2 sec. Find focal length of lens (in cm).

Grade:12

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