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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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