When an object is placed at the proper distance in front of a convex lens, the image falls on a screen 20 cm from the lens. A concave lens is now placed halfway between the convex lens and the screen. The screen must then be moved back a further 20 cm from the convex lens to obtain a clear image. What is the focal length of the concave lens?
When an object is placed at the proper distance in front of a convex lens, the image falls on a screen 20 cm from the lens. A concave lens is now placed halfway between the convex lens and the screen. The screen must then be moved back a further 20 cm from the convex lens to obtain a clear image. What is the focal length of the concave lens?
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Transcribed Image Text:When an object is placed at the proper distance in front of a convex lens, the image
falls on a screen 20 cm from the lens. A concave lens is now placed halfway
between the convex lens and the screen. The screen must then be moved back a
further 20 cm from the convex lens to obtain a clear image. What is the focal length
of the concave lens?
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