Optics 2 Question 5
5. A point source is placed at the bottom of a transparent block of height 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 on the top of the block. The refractive index of the liquid is
(2014 Adv.)
(a) 1.21
(b) 1.30
(c) 1.36
(d) 1.42
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Answer:
Correct Answer: 5. (c)
Solution:
- At point
angle of incidence is critical angle , where
In