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  • (a)    What is presbyopia ? State its cause. How is it corrected ? (b)    Why does the Sun appear reddish early in the morning ? Explain with the help of a labelled diagram.  

(a)    What is presbyopia ? State its cause. How is it corrected ?
(b)    Why does the Sun appear reddish early in the morning ? Explain with the help of a labelled diagram.

 

 

 

 
 
 
 
 

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(a)    Presbyopia    -    It is a defect of vision, which generally occurs at old age. In this defect, the person is unable to see nearby objects and also far off objects clearly.

        Causes    -    It arises due to the gradual weakening of Ciliary muscles and diminishing flexibility of the eye lens.

        Correction    -    By use of bi-focal lenses.

(b)    During sunrise, Sun is near horizon, sunlight has to travel larger distance and most of the blue light scatters, the red light on travel larger distances and reach the observer. Thus why sunset and sunrise appear reddish.

 

Posted by

Sumit Saini

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