A far sighted person cannot focus distinctly on objects closer than Im. What is the power of lens that will permit him to read from a distance of 40cm?

A far sighted person cannot focus distinctly on objects closer than Im

1.	A far sighted person cannot focus distinctly on objects closer than Im. What is the power of lens that will permit him to read from a distance of 40cm?
Answer» <html><body><p></p>Solution :As <a href="https://interviewquestions.tuteehub.com/tag/nearpoint-2860793" style="font-weight:bold;" target="_blank" title="Click to know more about NEARPOINT">NEARPOINT</a> is <a href="https://interviewquestions.tuteehub.com/tag/1m-283006" style="font-weight:bold;" target="_blank" title="Click to know more about 1M">1M</a> and distance of <a href="https://interviewquestions.tuteehub.com/tag/object-11416" style="font-weight:bold;" target="_blank" title="Click to know more about OBJECT">OBJECT</a> is 0.40m both in front of <a href="https://interviewquestions.tuteehub.com/tag/lens-1071845" style="font-weight:bold;" target="_blank" title="Click to know more about LENS">LENS</a>. <br/> `P=1/f=1/v+1/u=1/-1 -1/-0.40 <a href="https://interviewquestions.tuteehub.com/tag/implies-1037962" style="font-weight:bold;" target="_blank" title="Click to know more about IMPLIES">IMPLIES</a> P=1.5D`</body></html>