Even in absolutely clear water, a diver cannot see very clearly because of the following reasons?

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Because rays of light get diffused

Because velocity of light is reduced in water

Because a ray of light passing through the water makes it turbid

Because the focal length of the eye lens in water gets changed and the image is no longer focused sharply on the retina

answer is D.

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Detailed Solution

Even in absolutely clear water, a diver is unable to see very clearly because the focal length of the eye lens underwater gets changed, and the image is no longer focused sharply on the retina.
In absolutely clear water, the incoming light rays are hardly focused at all when we are underwater. The eye lens bends the incoming light ray a little, but due to the lost corneal refraction or corneal component of the eye, the image is not exactly focused on the retina.

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