Define the following terms a) Local length b) Principal axis

1.	Define the following terms a) Local length b) Principal axis
Answer» Principal axis: The line joining the centre of curvature and the optical centre is called the principal axis. Aperture: This is the length or breadth of the LENS through which REFRACTION takes place. Principal FOCUS: A LIGHT ray parallel to the principal axis of the lens meets at a POINT on the principal axis.

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Define the following terms a) Local length b) Principal axis​

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Define the following terms a) Local length b) Principal axis