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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Two parallel beams of light P and Q are incident normally on a prism and the transmitted rays are brought to focus with the help of a convergent lens as shown in figure. If the intensities of the upper and lower beams

Two parallel beams of light P and Q are incident normally on a prism and the transmitted rays are brought to focus with the help of a convergent lens as shown in figure. If the intensities of the upper and lower beams

(a) In illustration 3.10 how many dark rings will be observed on the wall? (b) What is the path difference at point P?