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    ​From where does most of the refracted light rays enter the eyes? ​
    Question

    ​From where does most of the refracted light rays enter the eyes? ​

    A.

    ​From the outer surface of the cornea​

    B.

    ​From the outer surface of the retina​

    C.

    ​From the outer surface of the iris​

    D.

    From the inner surface of the cornea

    Correct option is A

    The correct answer is (A) From the outer surface of the cornea.

    Explanation: Most of the refracted light rays enter the eye through the outer surface of the cornea. The cornea is the transparent, dome-shaped surface that covers the front of the eye. It refracts (bends) incoming light and helps to focus it onto the retina. The curvature of the cornea contributes significantly to the eye’s ability to focus images.

    Information Booster:

    • The cornea plays a primary role in focusing light onto the retina, the light-sensitive tissue at the back of the eye.
    • Light entering the eye is refracted both by the cornea and the lens, but most of the refraction occurs at the cornea.
    • The cornea is responsible for about 70-80% of the eye’s total focusing power, with the lens contributing the rest.

    Additional Information:

    • The retina (B) is the part of the eye that detects light, but light rays are focused onto it after passing through the cornea and lens.
    • The iris (C) is the colored part of the eye and controls the size of the pupil, but it doesn't directly affect the refraction of light entering the eye.
    • The inner surface of the cornea (D) does not play a direct role in the initial refraction of light entering the eye.

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