Question

Define the following terms for a lens
a ) optical centre
b ) principal axis
c ) principal focus
d ) focal length

Please give answer correctly...
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Answer 1

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• The ray strike to the pole is called Principal axis.

• The ray which parallel to the principal axis,After reflection it cut the principal axis. This is called as Focus.

• The distance between the center of a convex lens or a concave mirror is called as Focal length.

• A point on the axis of a lens that is so located that any ray of light passing through it is called as optical center.

Answer 2

Answer:-

a ) optical centre:- The centre point of a lens is known as optical centre.

b ) principal axis:- The line passing through the optical centre of the lens and perpendicular to both the faces of the lens is known as the principal axis.

c ) principal focus:- A light rays parallel to the principal axis of the lens meet at a point on the principle axis this point is known as the principal focus.

d ) focal length:- The distance of the point from the centre of lens at which a parallel ray of beam converge is known as focal length.

Hope it helps you

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