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प्रश्न
Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye.
उत्तर
A normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye. This is because the ciliary muscles of eyes are unable to contract beyond a certain limit. If the objects are placed at a distance less than 25 cm from the eye, then the objects appear blurred because light rays coming from the object meet beyond the retina.
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संबंधित प्रश्न
State whether the following statement is true or false:
The image formed on our retina is upside-down
Fill in the following blank with suitable words:
When light is dim, the pupil becomes................
What change is made in the eye to enable it to focus on objects situated at different distances? Illustrate your answer with the help of diagrams.
The animal which does not have eyes that look sideways is:
(a) Horse
(b) Chicken
(c) Lion
(d) Fish
Give scientific reason:
One can sense colours only in bright light.
Give the main function of the following:
Lachrymal glands
Give Technical Term:
The adjustment of the eye in order to obtain a clear vision of objects at different distances
Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:
Write the name.
The screen with light sensitive cells in human eye.
Write the main functional activity of the following structure.
Ciliary body and suspensory ligament
