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CBSE Class 10 Answered

What is the difference between principal focus and focal length?
Asked by shreyashahi3014 | 11 Aug, 2019, 10:02: PM
answered-by-expert Expert Answer
Principle focus is the point on the axis of a convex lens,  where the parallel rays of light from one side of the lens
meet on other side after refraction.
 
Distance between optical centre to principle focus point is the focal length
Answered by Thiyagarajan K | 12 Aug, 2019, 07:05: AM

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