light beam shines through air and then strikes a mirror, making an angle theta = 39.0 degrees with respect to the vertical, as shown. The reflected beam then strikes a pane of glass of thickness h = 1.68 cm, located a distance y= 48.5 cm from the mirror, and then exits the glass pane at the bottom, a horizontal distance x cm away from where it struck the mirror. What is the value of x?

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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.