Created by StemPy LabA photographer sticks black tape over the lower half of the front of a camera lens and then photographs a street scene. How does the picture compare with one taken with the whole lens open?
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← Light enters a piece of glass of refractive index 1.6, shaped as a plano-convex lens, through its curved side, which has a radius of 39 cm. It is reflected by a silver coating on the flat side. Seen from the front, the piece acts as a concave mirror. What is its focal length?A small mark lies at the bottom of a tank. An observer looks straight down through a layer of water 18 cm deep, with a refractive index of 1.33. By how much does the mark seem raised? →
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