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CBSE Class 10 Answered

a person with a myopic eye cnnot see objects beyond 1.2m directly.  what should be the type of the corrective lens used? what should be its power?
Asked by rs1702 | 24 Dec, 2018, 02:19: PM
answered-by-expert Expert Answer
A person cannot see the objects beyond 1.2 m 
Thus, his far point is 1.2 m 
This means he cannot see the distant objects. 
Object distance (u) = ∞
Image distance (v) = - 1.2 m = - 120 cm 
Thus focal length can be calculate using the lens formula,
1 over f equals 1 over v minus 1 over u 1 over f equals space fraction numerator 1 over denominator negative 120 end fraction minus 1 over infinity rightwards double arrow space 1 over f space equals fraction numerator begin display style 1 end style over denominator begin display style negative 120 end style end fraction minus 0 T h u s comma f space equals space minus space 120 space c m space space equals space minus 1.2 space m space
The defect called Myopia can be corrected using concave lens.
 
The power of lens that msut be used to correct his defect is 
P equals fraction numerator 1 over denominator f left parenthesis space i n space m e t r e s right parenthesis end fraction P equals space fraction numerator 1 over denominator negative 1.2 space m space space end fraction P space equals negative space space 0.83 space D space
Answered by Shiwani Sawant | 24 Dec, 2018, 02:57: PM
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