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White light containing wavelengths from 410 nm to 750 nm falls on a grating with 7200 slits /cm.How wide is the first-order spectrum on a screen 3.90 m away? Express your answer to three significant figures and include the appropriate units. HA Ay = Value UnitsWater waves having parallel crests 4.8 cm apart pass through two openings 7.6 cm apart in a board.At a point 3.0 m beyond the board, at what angle(s) 0 (0"