Question

the lens have two focal points where mirror have one why​

Answer 1

Answer:

Note that each lens has two focal points - one on each side of the lens. Unlike mirrors, lenses can allow light to pass through either face, depending on where the incident rays are coming from. Subsequently, every lens has two possible focal points.

Explanation:

Answer 2

Answer:

I hope it helps...

Explanation:

lens has two focal points - one on each side of the lens. Unlike mirrors, lenses can allow light to pass through either face, depending on where the incident rays are coming from. Subsequently, every lens has two possible focal points.