MEDIUM
7th CBSE
IMPORTANT
Earn 100

Define umbra and penumbra.

Important Questions on Light

EASY
7th CBSE
IMPORTANT
What is a solar eclipse?   
EASY
7th CBSE
IMPORTANT
What is diffused reflection?
HARD
7th CBSE
IMPORTANT
Define the term Principal focus.
MEDIUM
7th CBSE
IMPORTANT
Write the relationship between focal length and radius of curvature.
EASY
7th CBSE
IMPORTANT
What happens when white light passes through a prism?
MEDIUM
7th CBSE
IMPORTANT
What is the SI unit of Luminous Intensity?