Ray Optics and Optical Instruments - Result Question 12
12. A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?
[2007]
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 12. (d)
Solution:
- (d)
From pythagorus theorem, Hypotenuse comes out to be
Since,
Speed,
