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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A thin biprism (see figure) of obtuse angle alpha = 178 is placed at a distance l = 20 cm from a slit. How many images are formed and what is the separation between them? Refractive index of the material

A thin biprism (see figure) of obtuse angle alpha = 178 is placed at a distance l = 20 cm from a slit. How many images are formed and what is the separation between them? Refractive index of the material

A = 60 n = root 7/3. Find the minimum possible angle of incidence For a prism so that the light ray is refracted from the second surface. Also find delta max.