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

Question

Aicharya · Accepted Answer

tan ⁡ θ C = r h = 5.77 10 ≈ 3 ⇒ θ C = 30 o ⇒ sin ⁡ θ C = μ l μ b ⇒ μ l = 2.72 × 1 2 = 1.36

A point source S is placed at the bottom of a transparent block of height 10 mm and refractive index 2.72.…

Solution