Question

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?

• A. $2.4 \times {10}^8 m/s$
• B. $3.0 \times {10}^8 m/s$
• C. $1.2\times {10}^8 m/s$
• D. $1.8 \times {10}^8 m/s$

Answer 1

Answer: (D)

$1.8 \times {10}^8 m/s$

Answer 2