Question

what do u mean by focal length and principal access??​

Answer 1

Answer:

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Explanation:

5) Focal length ... 2) Principal axis: It is the line passing through the optical centre of the lens and perpendicular to both the faces of ... Can you help me provide access to these topics

Answer 2

Hi there!

Focal length

In physics, we define focal length as a length or distance between the center of a lens or mirror and its focus.  

Principal Axis

It is a line passing through the center of a mirror or a lens.