1.- What is the illumination produced by a 120 cd lamp on a perpendicular surface located at a distance of 2.5 cm? 2.5 cm away? 2.- A lamp in a classroom has an intensity of 250 cd, what is the illumination that it produces on a notebook, if there is a distance of 3m and an angle of 45º between them? 3.- Calculate the frequency and period of the waves produced on a guitar string, if they have a propagation speed of 140 m/s and their wavelength is 0.3 m/cycle.

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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.