Which of the following object is necessary for the formation of a shadow?
Write answers the following questions.
(a) Why does an object cast a shadow on a screen?
(b) What is the connection between the formation of shadows and the propagation of light?
(c) Explain what is meant by umbra and penumbra with the help of diagrams.
(d) When does a solar eclipse take place?
Light is necessary for the formation of a shadow.