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PHYSICS CH6 Light — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9SciencePHYSICS CH6 Light2 Marks
Question
Define principal focus of concave mirror.
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Answer

Principal focus (F): The point on the principal axis of the spherical mirror where the rays of light parallel to the principal axis meet or appear to meet after reflection from the spherical mirror.

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