How do you verify experimentally that `sin i/sin r` is a constant.

State and explain Lenz's law. Give one exmple to illustrate the law. How will you verify it experimentally ? Does it obey the principle of energy consevartion ?

How will you show experimentally that metals are good conductors of heat?

State Ohm's law. How can it be verified experimentally ? Explain with the help of a circuit diagram. Express the result graphically.

In the figure shown sin i/sin r is equal to