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प्रश्न
Explain why the image distance in the eye does not change when we change the distance of an object from the eye?
उत्तर
The focal length of the human lens can change i.e., increase or decrease, depending on the distance of objects and due to this the image distance in the eye does not change when we change the distance of an object from the eye. It is the ciliary muscles that modifies the curvature of the lens to change its focal length.
For example, to see a distant object clearly, the focal length of the lens should be larger. For this, the ciliary muscles relax to decrease the curvature and thereby increase the focal length of the lens. Hence, the lens becomes thin. This enables the image to be formed on the retina of the human eye.
Now if the same object is moved closer to eye, the ciliary muscles contract to increase the curvature and thereby decrease the focal length of the lens. Hence, the lens becomes thick and we still obtain the image of the object on the retina.
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संबंधित प्रश्न
Write the function of retina in human eye.
Myopia is an example of ______.
Name the part of the eye:
which changes the focal length of eye-lens.
Give the scientific names of the following parts of the eye:
changes shape to focus a picture on the retina.
Name two animals having eyes:
at the front of the head.
Name the muscles of the eye responsible for the power of accommodation.
With reference to the functioning of the eye, answer the question that follow:
Name the two structure in the eye responsible for bringing about the change in the shape of the lens.
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
State the Function:
Vitreous humour
Choose the Odd One Out:
