What is Principal Focus, Optical Centre and Principal Axis?
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Pls Answer this Above Question..
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Armies Pls Spread This News
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We should Save them and not let them to Disband
Let's show JYP Entertainment that They are not Alone
Plss Spread this News...
Borahae♡♡
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Answers & Comments
Principal axis is the straight line that passes through the center of curvatures. ... Principal focus is the point at which a beam of light that is parallel to principal axis will converge/diverges after refraction. Focal length is the distance between the optical center and principal focus of the lens.