Question

The focal length of the eye lens increases when eye muscles
(a) are relaxed and lens becomes thinner
(b) contract and lens becomes thicker
(c) are relaxed and lens becomes thicker
(d) contract and lens becomes thinner

NCERT Class X
Science - Exemplar Problems

Chapter_The Human Eye and
the Colourful World

Answer 1

the answer is A as the lens get longer and the focal length increases.

Answer 2

The 'focal length' of the eye lens increases when eye muscles are relaxed and the lens becomes thinner.

Option (a)

Explanation:

• Our eyes have the ability to alter its focal length with help of the ciliary muscles to form the image of the object on the retina. This is called the power of accommodation.
• When an eye looks at any distant object, the muscles relax and the lens forms less curvature. The image is developed at the retina when increasing in the focal length.

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