A convex lens forms an image of an object on a screen 30 cm from the l – InterviewSolution

1.	A convex lens forms an image of an object on a screen 30 cm from the lens. When the lens is moved 90 cm towards the object, the image is again formed on the screen. Then the focal length of the lens is
Answer» A convex lens forms an image of an object on a screen $30 cm$ from the lens. When the lens is moved $90 cm$ towards the object, the image is again formed on the screen. Then the focal length of the lens is

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