the reflected intensity of light normally incident on an interface betweentwo transparent media. (a) For light normally incident on an interface between vacuum and a transparent medium of index n, show that the intensity S2 of the transmitted light is given by S2/S1 = 4n/(n + 1)2. (b) Light travels perpendicularly through a diamond slab, surrounded by air, withparallel surfaces of entry and exit. Apply the transmission fraction in part (a) to find the approximate overall transmission through the slab of diamond, as a percentage. Ignore light reflected back and forth within the slab.

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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.