A point source S is placed at the bottom of a tranparent block of height 10mm and refractive index 2.72. It is immersed in a low

A point source S is placed at the bottom of a tranparent block of height 10mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the liquid is `

A. 1.21
B. 1.3
C. 1.36
D. 1.42

A point source S is placed at the bottom of a tranparent block of height 10mm and refractive index 2.72. It is immersed in a lower refractive index li

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