A magnifying glass is to be used at the fixed object distance of 1 inch. If it is ro produce an erect image 5 items magnified. its focal length should be
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u=1 inch ,m=5 f=?
therfore
1/f=1/v+1/u.............. (1)
• •
• m=-v/u
5= -v/1
v= -6
therefore
1/f = 1/-6 +1/1
1/f= -5/-6
F=6/5= 1.2 inch
therfore
1/f=1/v+1/u.............. (1)
• •
• m=-v/u
5= -v/1
v= -6
therefore
1/f = 1/-6 +1/1
1/f= -5/-6
F=6/5= 1.2 inch
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