Q: The line joining the two focii of a lens is called ................
A.
paraxial ray
B.
principal axis
C.
Focal length
D.
radius of curvature
Correct Answer:
Option B - The straight line passing through the geometrical centre of a lens and joining the two centres of curvature of its surfaces. Sometimes the optical axis of a lens is called its principal axis.
B. The straight line passing through the geometrical centre of a lens and joining the two centres of curvature of its surfaces. Sometimes the optical axis of a lens is called its principal axis.
Explanations:
The straight line passing through the geometrical centre of a lens and joining the two centres of curvature of its surfaces. Sometimes the optical axis of a lens is called its principal axis.
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