With the help of a diagram, define the principal focus of
a. convex lens

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Solution

A point on the principal axis where all the parallel rays of light passing through the lens converge after refraction is known as principal focus or simply focus.
The figure below shows the principal focus of a convex lens.

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Similar questions

(a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. (b) Define the principal focus of a concave lens.

(a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram. (b) State whether concave lens has a real focus or a virtual focus. (c) List some things that concave lens and convex mirror have in common.

Define the term principal foci of a concave lens and show them with the help of proper diagrams.

Q. (a) Explain with the help of a diagram, why the convex lens is also called a converging lens.
(b) Define principal axis, principal focus and focal length of a convex lens.

Q. Define principal focus of the convex lens.

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With the help of a diagram, define the principal focus ofa. convex lens

A point on the principal axis where all the parallel rays of light passing through the lens converge after refraction is known as principal focus or simply focus.The figure below shows the principal focus of a convex lens.

With the help of a diagram, define the principal focus of
a. convex lens

A point on the principal axis where all the parallel rays of light passing through the lens converge after refraction is known as principal focus or simply focus.
The figure below shows the principal focus of a convex lens.