PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

Book Free Demo
A person needs a lens of power -5.5\ dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5\ dioptre. What is the focal length of the lens required for correcting
(i) distant vision, and
(ii) near vision?
 
The power (P) of a lens of focal length (f) is given by the relation,
Case (i):
 
Power of the lens used for by the person correcting distant vision =\ −5.5\ D
 
Distant vision of the person =  m
 
Case (ii):
 
Power of the lens used by the person for correcting near vision =\ +1.5\ D
 
Near vision of the person = m
(Note: Enter your answer with three decimal digits)