I don\’t think Sonal, that principal axis is a definite line segment or its mid point could be found to get focus. Principal axis is a line of infinite length which can be produced on both sides of a lens or mirror.
midpoint of principal axis
But can u tell me in short
Okk
The light rays coming from distinct object appear to meet at point in case of concave mirror and tends to meet at point when drawn backward in case of convex mirror. That point is called focus.
Rajendra Jatin Ben
Asked: 2 years ago2022-11-05T20:59:04+05:30
2022-11-05T20:59:04+05:30In: Class 10
What is focus ?
What is focus ?
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A focus is the point where light rays originating from a point on the object converge.