Created by StemPy LabA lens of focal length is used in a displacement experiment on an optical bench. Which condition on the distance 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?
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← Two stars lie very close together in the sky. A club observes them through a refracting telescope whose lens is 12 cm across, using a blue filter that passes light of wavelength 460 nm. What is the smallest angle between the stars for which they still look like two?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? →
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