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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A glass lens is coated on one side with a thin film of magnesium fluoride (MgF2) to reduce reflection from the lens surface (see figure). The index of refraction of MgF2 is 1.38; that of the glass is 1.50.

A glass lens is coated on one side with a thin film of magnesium fluoride (MgF2) to reduce reflection from the lens surface (see figure). The index of refraction of MgF2 is 1.38; that of the glass is 1.50.

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