. Real life example of Constructive Interference A. Light reflected from a film of oil floating on water. B. Laser C. Mirror D. Butterflies 7. Real life example of Coherence source. A. Light reflected from a film of oil floating on water. B. Laser C. Mirror D. Butterflies 8-10. Give atleast 3 General Conditions for Interference. A. The waves are of a single frequency. B. Monochromatic. C. The waves generated have a constant phase difference D. The source must be small enough to produce wide fringes. E. Coherence is used to check the quality of the transfer functions. F. Coherent sources of light are needed.

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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.