Science, asked by saniya12390, 10 months ago

what is meant by focal length?

Answers

Answered by kuttyvaishnavi

3

Explanation:

the distance between the centre of a lens or curved mirror and its focus.

the equivalent distance in a compound lens or telescope.

Answered by thatonesuket

2

Answer:

When a parallel Ray Of Light is incident on the Spherical Mirror /Lens then then after reflection ( in Mirrors) / Refraction (In Lens) it cuts the Principal Axis at a point which is called Focus. The distance between the Pole (In Mirror) / Optical Center( In Lens) and the focus is called the Focal Length.

Explanation:

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