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CBSE Class 10 Answered

Why 'u' in myopia is considered as infinity
Asked by pranjalbhagat7777 | 12 Feb, 2019, 10:01: AM
answered-by-expert Expert Answer
A myopic eye can see the nearby objects clearly but is unable to see clearly the far objects kept at his infinity.
 
For example, if the far point of the myopic eye is 90 cm then the person suffering can see the objects between the range of 25 cm (least distance of distinct vision) and 90 cm clearly and distinctly but cannot see the objects from 90 cm onwards to his infinity.
Hence in order to correct his defect doctors must prescribe him such a concave lens which will form the image of the far object on his far point i.e 90 cm in this case. Hence, while calculating the focal length and power of concave lens for a myopic eye the object distance 'u' is considered as '∞' while the image distance 'v' is considered as the far point (in the given example it is 90 cm). 
Answered by Shiwani Sawant | 12 Feb, 2019, 11:27: AM

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