The reason why the water drops on a lotus leaf look bright:
Answer: The water drops on a lotus leaf look bright like a pearl. This is because the lotus leaves have fine hairs. Water drops are trapped in those grooves. As a result, there is air below the water droplet. Rays of light that pass through the droplet and strike the bottom of the droplet at an angle greater than the critical angle of water and air are totally reflected. When those reflected rays hit the eye, the droplet appears shiny.