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One end of a cylindrical glass rod shown...

One end of a cylindrical glass rod shown in figure, is ground to a hemispherical surface of radius `R=20mm.`

a. Find the image distance of a point object on the axis of the rod, 80mm to the left of the vertex. The rod is in air.
b. Let the same rod be immersed in water of refractive index `4//3` , the other quantities having the same values as before. Find the image distance.

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