What is the shape of the wavefront in each of the following cases :
light diverging from a point source

What is the shape of the wavefront on Earth for sunlight?

What is the shape of the wave front in each of the following cases : the portion of the wavelength of light from a distant star intercepted by the Earth

What is ray of light w.r.t. wavefront ?

Answer the following questions A plane mirror is kept at the bottom of a trough with water in it as show in the following figure . The ray of light emerging from a source at the point S outside the trough, reaches the point A on the surface of water. Draw a neat ray diagram to show the subsequent path of light and complete the ray diagram.

What is the geometrical shape of wavefront of light emerging out of a convex lens when a point source is placed at its focus ?

What is the shape of a wavefront emitted by a light source in the form of a narrow slit ?

Discuss the directions of force and of displacement in each of the following cases: Stopping a moving car by applying brakes.

Discuss the directions of force and of displacement in each of the following cases: Walking up and down a staircase, climbing a tree.

What is the shape of the equipotential surfaces for an isolated point charge ?

Discuss the directions of force and of displacement in each of the following cases: Catching the ball which your friend has thrown towards you.