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QAIPMT-2007-Ph-2373: NEET 2007 Physics - Class 11 AIPMT-2007-Ph-2373 Solution: A small coin is resting on the bottom of a beaker filled with…
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?
Multiple Choice Options
- A 45 o
- B 30 o
- C 90 o
- D 60 o
Step-by-Step Verified Solution
| A _ _ B _ | = 3 ( A _ . B _ )
_ A B sin _ _ = 3 A B cos _ _
or tan _ _ = 3 or _ = tan _ 1 3 = 60 _ ;