The pupil of the human eye can vary in diameter from 2.00 mm in bright light to 8.00 mm in dim light. the eye has a focal length of about 25 mm, and the visible spectrum extends from 390 nm (violet) to 750 nm (red). note that the light-sensitive cells on the retina have radii ranging from 0.75 μm to 3.0 μm.

The indicated data are of clear understanding for the development of Airy's theory. In optics this phenomenon is described as an optical phenomenon in which The Light, due to its undulatory nature, tends to diffract when it passes through a circular opening.

The formula used for the radius of the Airy disk is given by,

Where,

Range of the radius

wavelength

f= focal length

Our values are given by,

State 1:

State 2:

Replacing in the first equation we have:

And also for,

Therefor, the airy disk radius ranges from to

c) up

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