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                                    : 60Namedhe_ defect-ar-nationcmdeyectLonipute the powex aPowerě.. dhalenĂ. | 
                            
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Answer»  The focal length of spectacles is -60 cm and we know that concave lens have the focal length in negative. and concave lens are used to correct myopia or short-sightedness. the power of the lens =1/f. since the focal length is in centimetres we convert it by dividing by100 100/-60=power of lens -100/60, i.e, -5/3 or -1.66D  | 
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