The distance between optical centre and is known as focal length of the lens.

principal focus

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centre of curvature

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aperture

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Solution

The correct option is A principal focus
The distance between the optical centre and principal focus is called focal length of the lens. Principal focus is the point where parallel rays coming from infinity meet or appear to meet.

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The distance between optical centre and is known as focal length of the lens.

The correct option is A principal focusThe distance between the optical centre and principal focus is called focal length of the lens. Principal focus is the point where parallel rays coming from infinity meet or appear to meet.

The correct option is A principal focus
The distance between the optical centre and principal focus is called focal length of the lens. Principal focus is the point where parallel rays coming from infinity meet or appear to meet.