Physics
Grade-10
Easy
Question
The eye lens ____ and ____ its focal length when the object is nearby and far away respectively.
- Increases, decreases
- Increases, remains the same
- Remains the same, decreases
- Decreases, increases
Hint:
While seeing a distant object our lens stretches or expands and vice versa.
The correct answer is: Decreases, increases
The correct option is d)Decreases, increases.
A change in the curvature of the lens of the eye can change its focal length. As the muscles relax, the lens becomes thinner. This increases the focal length. This allows you to see distant objects clearly. When we look at something close to our eyes, the ciliary muscles contract. This increases the curvature of the eye lens. Then the lens of the eye thickens. As a result, the focal length of the eye lens is reduced. This allows you to see nearby objects clearly.
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