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What is the function of Iris?

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What is the function of Iris?

(a) Source of nutrition

(b) Detect color

(c) Varies focal length

(d) Control amount of light

I had been asked this question by my college professor while I was bunking the class.

The above asked question is from Elements of Visual Perception in portion Image Restoration and Reconstruction of Digital Image Processing

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The correct option is (d) Control amount of light

The explanation is: Iris is responsible for controlling the amount of light that enters the human eye.

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