Question

How is it possible that our eye allows sharp image formation from both distant and nearby objects?

a. The refractive index of the cornea changes depending on how far the viewed object is.

b. The shape of the lens changes between close-up and distant viewing, focusing the light on the retina.

c. The muscles surrounding the eye can contract or relax, slightly changing the shape of the eye and thus allowing the incoming light to be focused on the retina regardless of viewing distance.

d. When viewing distant objects, the pupil dilates to allow more light into the eye and increase the depth of field.

e. It isn’t that’s why we need binoculars to see far-away objects.

Answer 1

The correct answer is B. The shape of the lens changes between close-up and distant viewing, focusing the light on the retina. The ciliary muscle regulate the lens shape and size. To focus a distant object the lens becomes thinner and to focus a near by object it becomes thicker. Thus lens gives better resolution yo image formed in retina.

Refractive index of cornea does not change in any case. It only helps in refraction.

The muscle around the eye balls known as extraocular muscle only help to regulate the eye movement not eye contraction.

The role of pupil is only to regulate the amount of light entering the eye. It does not effect the resolution of image formed.

Very far distant objects only need binoculars to have a close and clear view.

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