What is the effect of increasing the number of lines ruled o diffraction grating?   Select one: a. The interference pattern will be less sharp. b. Only shorter wavelengths can be diffracted. c. The spectrum will be broader. d. The distance between the slits will be increased.

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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.