Advertisements
Advertisements
प्रश्न
State one role of ciliary muscles in the human eye.
Advertisements
उत्तर
The ciliary muscles in the eye support the lens and hold it in place. They also change the shape of lens by contracting or relaxing. This process is called accommodation.
APPEARS IN
संबंधित प्रश्न
Which defect of vision can be rectified:
by using a concave lens?
What is the other name for
hypermetropia
A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard.
Name the type of defect he is suffering from.
A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision?
An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity? Also calculate the power of lens required. Is this eye long-sighted or short-sighted?
Explain the terms ‘adaptation’ and ‘accommodation’ with reference to the eye.
The diagram alongside represents a section of a mammalian eye.
(i) Label the parts 1 to 5 of the diagram.
(ii) State the function of the parts labelled 4 and 5.
(iii) With the help of a diagram show the short sightedness.
Give Reason:
Older people require glasses to read and write.
When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?
Name the following:
Two kinds of accomodations.
