Q : The size of the the pupil can be varied by the iris.What is the purpose of this?
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ᵗʰᵉⁱʳ ᶠᵘⁿᶜᵗⁱᵒⁿ ⁱˢ ᵗᵒ ˡᵉᵗ ⁱⁿ ˡⁱᵍʰᵗ ᵃⁿᵈ ᶠᵒᶜᵘˢ ⁱᵗ ᵒⁿ ᵗʰᵉ ʳᵉᵗⁱⁿᵃ (ᵗʰᵉ ⁿᵉʳᵛᵉ ᶜᵉˡˡˢ ᵃᵗ ᵗʰᵉ ᵇᵃᶜᵏ ᵒᶠ ᵗʰᵉ ᵉʸᵉ) ˢᵒ ʸᵒᵘ ᶜᵃⁿ ˢᵉᵉ. ᵐᵘˢᶜˡᵉˢ ˡᵒᶜᵃᵗᵉᵈ ⁱⁿ ʸᵒᵘʳ ⁱʳⁱˢ (ᵗʰᵉ ᶜᵒˡᵒʳᵉᵈ ᵖᵃʳᵗ ᵒᶠ ʸᵒᵘʳ ᵉʸᵉ) ᶜᵒⁿᵗʳᵒˡ ᵉᵃᶜʰ ᵖᵘᵖⁱˡ. ʷʰⁱˡᵉ ʸᵒᵘʳ ᵗʷᵒ ᵖᵘᵖⁱˡˢ ʷⁱˡˡ ᵘˢᵘᵃˡˡʸ ᵇᵉ ʳᵒᵘᵍʰˡʸ ᵗʰᵉ ˢᵃᵐᵉ ˢⁱᶻᵉ, ᵖᵘᵖⁱˡ ˢⁱᶻᵉ ᵒᵛᵉʳᵃˡˡ ᶜᵃⁿ ᶠˡᵘᶜᵗᵘᵃᵗᵉ.
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