Question

In the given Fig. out of the positions $ A, B, C,$ and $ D$ which will indicate the position of the sun? Draw the sun at the appropriate position.

(B) (A) (C)

Answer 1

Rectilinear Propagation of Light

1. According to classical theory, light travels in a straight path.
2. Therefore, for an opaque object, these straight rays of light hit the surface of the opaque object that is exposed to light.
3. This forbids the light to travel beyond this object which forms a shadow.
4. Hence, a shadow is nothing but an area that light rays cannot reach.

Light from Sun

1. Sun is our main or primary source of light.
2. The light ray from a sun travels through a straight path and reaches the surface that is facing towards the sun.
3. This portion of the surface of the earth experiences daytime.
4. In the portion opposite this surface, a shadow is formed.
5. This portion of the surface of the earth experiences nighttime.
6. As the earth rotates each portion of the surface of the earth faces the sun at some point in time.
7. In this way, day and night are experienced.
8. Therefore, in the given figure since the portion $\left(C\right)$ of the earth is illuminated, the position of the sun will be at $\left(C\right)$.

Hence, the position of the sun is at $\left(C\right)$.