Snell’s Law relates the angle of incidence with the angle of refraction as n1 sin θ1 = n2 sin θ2. If a laser beam of 650 nm (red light) travels through the air and enters the water at an angle of 30 degrees with respect to the normal, what angle does the refracted ray make with the vertical? What is the wavelength of the red light in water?

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.