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

Q. The distance between the optical centre of lens and the focal point is called :

Q. a) For convex lens, distance of real image from the optical centre is .........
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The ray diagram given below illustrates the experimental set up for the determination of the focal length of a converging lens using an auxiliary mirror:

The distance between the object and optical centre of the lens is

Q. The distance between principal focus and optical centre is known as

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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.