A beam of light propagating through water (nwater = 4/3) strikes a glass plate (nglass = 3/2) at 30° incident angle and is reflected. What is the angle of reflection and speed of the reflected beam? (c = speed of light in vacuum) a. 30°; c/2 b. 30°; 3c/4 c. 30°; 2c/3 d. 60°: 3c/4 e. 60°; 2c/3

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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.