Question

Discuss Rayleigh’s criterion for resolving power of an optical instrument. Obtain an expression for resolving power of a microscope. 

19 Jan 2026
Answer :
Word Count : 519
The resolving power of an optical instrument refers to its ability to distinguish between two closely spaced points or objects. When two point sources are very close to each other, the images formed by the optical instrument may overlap, making it difficult to distinguish them. Lord Rayleigh formulated a criterion, known as Rayleigh’s criterion, which provides a practical limit for resolution based on the diffraction of light. According to Rayleigh’s criterion, two point sources are just resolvable when the principal maximum of the diffraction pattern of _________ __________ ________ ___ _____ _________ ______ ____ ______ _______ __________ __________.
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