Fermat's Principle of Least Time

Q. A ball of mass m hits the floor with a speed v making an angle of incidence q = 45° with the normal to the floor. If the coefficient of restitution e = 0.707 then the speed of the reflected ball and the angle of reflection are

Q.

A water, oil emulsion is a non-homogeneous mixture of water and oil, held together by an emulsifier (a substance that stabilizes an emulsion, in particular an additive used to stabilize processed foods) , like egg! If you shine a laser beam through a beaker of this emulsion, it will surely travel in a straight line.

1. True
2. False
3. True if I shine light horizontally
4. True if I shine light vertically