Question

Define ---Lens, Focal length, Focus, Optic centre, Principal axis,
Radius of curvature, Centre of curvature, Focal plane.​

Answer 1

Answer:

LENS:

A lens is a piece of transparent glass which concentrates or disperses light rays when passes through them by refraction. Due to the magnifying property, lenses are used in telescopes and other magnifying devices.

FOCAL LENGTH:

the distance between the centre of a lens or curved mirror and its focus.

PRINCIPLE FOCUS:

Focus is the point where light rays originating from a point on the object converge. The principal focus is defined as the point where a beam parallel to the principal axis appears to diverge converges from a point on the principal axis after passing through the lens.

OPTIC CENTRE:

The point on the optical axis of a lens where all rays passing through it remain unrefracted.

PRINCIPLE AXIS:

the line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror.

RADIUS OF CURVATURE:

the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.

CENTRE OF CURVATURE:

the centre of a circle which passes through a curve at a given point and has the same tangent and curvature at that point.

FOCAL PLANE :

the plane through the focus perpendicular to the axis of a mirror or lens.

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