Question

Draw a convex lens. Mark its Focal Points, Optical centre, Aperture Size, Principal Axis, Oblique

Rays and Paraxial Rays.​

Answer 1

Convex lens:

• Focal point is a point on the principal axis through which paraxial light rays pass after getting refracted from the lens.

• Optical centre is a point in the lens through which light rays pass undeviated.

• Principal axis is an imaginary line passing through the focus and centre of curvature of the lens which we consider to be our reference line.

• Oblique rays are those light rays which are not parallel to the principal axis.

• Paraxial light rays are those light rays which are parallel and close to the principal axis.

• Aperture of a convex lens is the dimension of the lens exposed to the light rays.

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