light ray from air is incident to the surface of water ( n=1.33) at an angle of 30°. If the light ray from air is incident on the surface of a glass ( n= 1.73), what is the speed of light in the glass? 1.25 x 108 m/s 1.73 x 108 m/s 1.8 x 108 m/s 2.7 x 108 m/s The angle of refraction in the glass is _____ degrees.

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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.