The human eye and the colourful world Worksheet-1
A. presbyopia B. near sightedness
C. accommodation D. far-sightedness
A. cornea B. pupil C. iris D. retina
A. 25 m B. 25 cm C. 2.5 cm D. 2.5 m
A. pupil B. retina C. iris D. ciliary muscles
A. cornea B. retina C. iris D. yellow point
A. pupil does not open
B. pupil does not close
C. adjustment of the size of pupil takes some time
D. none of these
C. sometimes contracts and sometimes expands
D. neither contracts nor expands
A. rod shaped cells B. cone shaped cells
C. both types of cells D. neither of the two
A. double convex lens B. double concave lens
C. piano convex lens D. piano concave lens
A. short sightedness B. long sightedness
C. cinematography D. colour vision
Explanation: The property of the eye to adjust the focal length of eye lens is called accommodation.
Explanation: The human eye forms the image of an object at its retina.
Explanation: The least distance of distinct vision for a young adult with normal vision is 25 cm.
Explanation: The action of ciliary muscles holding the eye lens changes the focal length of eye lens enabling the eye to focus the image of objects at varying distances.
Explanation: Change in the size of the pupil by the iris takes some time.
Explanation: In bright sunlight, pupil of the eye contracts so as to allow only a little light to enter the eye.
Explanation: The property of persistence of vision is used in projection of still pictures taken by a movie camera.