Question

if the focal length of a magnifying glass is 2.5 cm then it can magnify an object
1)2.5 times
2)15 times
3)11 times
4) none of these

Answer 1

11 times
m=n/f + 1 (n is near point that is 25cm) m=25/2.5 +1 = 11 so answer is 11times

Answer 2

m=n/f+1 ( n is near point that is 25cm)
m=25/2.5+1 = 11 {so answer is 11 times}