A lightbulb is immersed in water.  Light travels out in all directions from the bulb, but only some of the light escapes the water's surface (see figure attached which happens to be for a glass/air interface instead of a water/air interface).  What happens to the fraction f of light that escapes the water's surface as the bulb is moved deeper into the water?  (assume the light is not absorbed by the water itself).   a. f remains the same. b. f increases. c. f decreases. d. the answer depends on the index of refraction of the 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.