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Spherical Lens

The distance ...

Question

The distance between principal focus and optical centre is known as

A

Aperture

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B

Principal Axis

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C

Focal length

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D

Radius of curvature

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Solution

The correct option is C Focal length
Correct answer is (c)

The focal length of an optical system is a distance measure between principal focus and optical centre, it also defines the lens’s angular field of view.For a given lens, the shorter the focal length, the wider the angular field of the lens.

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