Created by StemPy LabFor a demonstration, a thin glass lens of refractive index and focal length cm in air is lowered into a tank of water of refractive index . What is its focal length under the water?
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← A bright filament and a white card are fixed 130 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 60 cm along the bench. What is the focal length of the lens?A block of glass has a cavity of air inside it, in the shape of a biconvex lens. A narrow parallel beam of light travels through the glass along the axis of the cavity. What does the cavity do to the beam? →
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