Question

Select One Correct Option from the following: A point source S is placed at the bottom of a transparent block of height 10 mm 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) 1.30
(C) 1.36
(D) 1.42.

Answer 1

yes b option is correct.
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Answer 2

Select One Correct Option from the following: A point source S is placed at the bottom of a transparent block of height 10 mm 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) 1.30

(C) 1.36

(D) 1.42.