Created by StemPy LabA bright filament and a white card are fixed cm apart. A convex lens held between them throws a sharp image on the card at one position, and at another position after it is slid cm along the bench. What is the focal length of the lens?
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← A lens of focal length f is used in a displacement experiment on an optical bench. Which condition on the distance D between the illuminated slit and the screen must hold if the screen is to show a sharp image at two different positions of the lens?For a demonstration, a thin glass lens of refractive index 1.5 and focal length 14 cm in air is lowered into a tank of water of refractive index 1.33. What is its focal length under the water? →
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