We can see the sun even when it is little below the horizon because of ....

Give scientific reasons The sun is seen on the horizon a little before sunrise.

Fill in the following blanks with suitable words : We can see the sun about………..minutes before the actual sunrise and about……..minutes after the actual sunset because of atmospheric……….

Assertion: The rainbow is seen sometimes in the sky when it is raining. When one sees a rainbow, one's back is towards the sun. Reason: Interanl reflection from water droplet causes dispersion. The final ray is in the backward direction.

When we see below the horizontal line , then the angle formed is ………….. .

When we see at a lower level , from the horizontal line , angle formed is ………..

We can define the term charge density when distribution of charge is _______.

In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a, answer the followings: How can we derive an absorption spectrum for any susbtance?

When we hear a sound, we can identify its source from ______.