Question

what do you understand by the focus of a lens? how will you find the focus of a convex lens

Answer 1

The focus of a lens is  the point on the axis of the lens to which parallel rays of light converge or from which they appear to diverge after refraction.

Answer 2

Answer:

Focus

It is the point where refracted rays actually meet or appear to meet .

We can find it by locating the point where rays converge .The image location would be at that point that is at F.

Explanation:

Lens : The two curved surfaces bounded at certain angle .

We come across two types of lenses :

• Concave
• Convex

Concave lens

• It is diverging lens that is it make all refracted rays split in different direction .
• The point where rays appear to meet is focus .
• It has virtual focus .

Convex lens

• It is converging lens .
• The point where rays actually meet refers to focus .
• It has real focus .