Created by StemPy LabWhich of these pairs of sources is coherent?
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← A screen is lit by two coherent laser beams. Each beam alone would light a spot on it with 2.5 W/m². At the spot, the crests of one beam arrive a quarter of a cycle after the crests of the other. What is the intensity of the light there?A teacher holds a card with two narrow slits in front of a lamp that gives light of wavelength 570 nm. A white wall 1.5 m behind the card shows a pattern of stripes. The cuts in the card are 0.45 mm apart. How wide is each bright stripe, from the middle of one to the middle of the next? →
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