Concave lens is also called as lens....

Concave lens is also called as _______lens.

Text Solution

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(i) Rays travelling parallel to the principal axis of a concave lens diverge after refraction in such a way that they appear to be coming out of a point on the principal axis.
(ii) This point is called the principal focus of the concave lens.
(iii) Light rays parallel to the principal axis falling on a concave lens go away from one another (diverge) after refraction. So, this type of lens is called diverging lens.

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Assertion : A parallel beam of light passing through the concave lens , is diverged or spread out Reason : A convex lens is also called as diverging lens.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

Assertion is true but reason is false.

Assertion is false but reason is true.

If one the faces of a biconcave lens is plane, it is known as _______ lens.

concave

convex

plano-concave

The distance between the lens and focus is called ____________.

pole

radius of curvature

focal length

principal axis