Question

define principal focus​

Answer 1

Answer:

The principal focus is defined as the point where a beam parallel to principal axis appears to diverge converges from a point on the principal axis after passing through the lens.

Explanation:

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Answer 2

Question-

Define principal focus.

Answer:-

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The principal focus is defined as the point where a beam parallel to the principal axis appears to diverge converges from a point on the principal axis after passing through the lens.

More to know:

• Focus is the point where light rays originating from a point on the object converge.
• A number of rays which falls parallel to the principal axis after getting reflected, the rays seems to come from a point on the principal axis. This is called as Principal focus Convex Mirror.
• number of rays which falls parallel to the principal axis on a concave mirror meets at a point on the principal axis after getting reflected. This is known as the principal focus of a concave mirror.

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