(16) Please don't write on a paper. I can't understand handwritten. Light from fluorescent bulb falling on two slits 0.0076 mm apart produces the seventh order bright fringe at an 33.69° angle. What is the wavelength of the light used?

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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.