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(A) The elderly people, may have both near sightedness and far sightedness. Write the possible solutions, can be proposed for correction of their eye defect.
(B) How does the eye control the amount of light entering into it ?
(B) How does the eye control the amount of light entering into it ?
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(A) (i) They either use two sets of spectacles one for correcting Near sightedness and other for correcting farsightedness (1 Mark)
(ii) Use bifocal spectacles / use progressive lenses. (1 Mark)
(B) The pupil regulates and controls the amount of light entering the eye. The size of pupil is regulated by Iris (a muscular diaphragm). (1 Mark)
(ii) Use bifocal spectacles / use progressive lenses. (1 Mark)
(B) The pupil regulates and controls the amount of light entering the eye. The size of pupil is regulated by Iris (a muscular diaphragm). (1 Mark)