Physics
Define the term principal axis of a lens.
Refraction Lens
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Answer
The line joining the centres of curvature of the two surfaces of the lens is called the principal axis.
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Related Questions
Name the two kinds of lens? Draw diagrams to illustrate them.
State difference between a convex and a concave lens in their —
(a) appearance, and
(b) action on the incident light.
Explain the optical centre of a lens with the help of proper diagram(s).
A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens.
(a) What special name is given to this point on the principal axis?
(b) Draw a labelled diagram to support the answer in part (a).