Question

ordinary eyes can not see object close to 25 cm​

Answer 1

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True

If an object is placed very close to the eyes the light reflected from it does not fall on the retina. It either falls in front of the retina or behind it or on the blindspot. Hence, we cannot see the object. The minimum distance for seeing an object clearly is 25cm.

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Answer 2

Answer:

True

• A normal eye cannot see clearly the objects that are placed closer than 25cm because the power of accommodation of the eye is 25cm which is exhausted. When the maximum accommodation of the eye is reached, the ciliary muscles of the eye lens cannot become thicker.

• If an object is placed very close to the eyes the light reflected from it does not fall on the retina. It either falls in front of the retina or behind it or on the blindspot. Hence, we cannot see the object. The minimum distance for seeing an object clearly is 25cm.

• 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. ... This ability is called the power of accommodation of the eyes.

• A normal eye can see objects kept at various distances clearly due to the ability of the ciliary muscles to increase or decrease its focal length of the eye lens. ... Hence, the object closer than 25 cm appears blurred because light rays coming from the object meet beyond retina.

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