A laser light shines on an unknown block of material of thickness 8.7 cm (y-direction) with an incidence angle of 73.6 degrees to location x=0. If the beam exits the material on the other side of the block at location x=9.5 cm, then what is the value of the index of refraction of the material. Assume the laser light is originally traveling through air with index of refraction 1.

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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.