Suppose a microscope’s resolution is diffraction limited. Which one of the following changes would provide the greatest improvement to its resolution? (a) Observing at a longer wavelength through a smaller aperture. (b) Observing at a shorter wavelength through a larger aperture. (c) Decreasing the object distance. (d) Using a CCD sensor instead of a standard eyepiece.

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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.