Define the Principal Axis. - Physics

Define the principal axis.

Definition

It is the straight line passing through both the centres of curvatures, C₁ and C_2, and also through its optical centre O.

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Chapter 4: Refraction through Lenses and Optical Instruments - Figure Based Long Answers

Chapter 4 Refraction through Lenses and Optical Instruments
Figure Based Long Answers | Q 2.1