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Question
Assertion :A normal human eye can clearly see all the objects at the different distance. Reason: The human eye has the capacity to suitably adjust the focal length of its lens to a certain extent.
Assertion :A normal human eye can clearly see all the objects at the different distance. Reason: The human eye has the capacity to suitably adjust the focal length of its lens to a certain extent.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When the ciliary muscles are relaxed, the eye lens becomes thin, the focal length increases, and the distant objects are clearly visible to the eyes. To see the nearby objects clearly, the ciliary muscles contract making the eye lens thicker. Thus, the focal length of the eye lens decreases, and the nearby objects become visible to the eyes. Hence, the human eye lens is able to adjust its focal length to view both distant and nearby objects on the retina. This ability is called the power of accommodation of the eyes.
When the ciliary muscles are relaxed, the eye lens becomes thin, the focal length increases, and the distant objects are clearly visible to the eyes. To see the nearby objects clearly, the ciliary muscles contract making the eye lens thicker. Thus, the focal length of the eye lens decreases, and the nearby objects become visible to the eyes. Hence, the human eye lens is able to adjust its focal length to view both distant and nearby objects on the retina. This ability is called the power of accommodation of the eyes.
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