A) -1.5
B) 1.5
C) -3
D) 3
Correct Answer: C
Solution :
Now from the formula for mirror \[\frac{1}{\upsilon }+\frac{1}{u}=\frac{1}{f}\] ?(1) Multiplying Eq. (1) by u on both sides \[\frac{u}{\upsilon }+1=\frac{u}{f}\]or \[\frac{1}{m}+1=\frac{u}{f}\] (As \[\frac{\upsilon }{u}=m\]) or \[\frac{1}{m}=\frac{u}{f}-1\]or \[m=\frac{f}{u-f}\] ?(2) Putting the given values in Eq. (2), we obtain \[m=\frac{-15}{-10+15}=-\frac{15}{5}=-3\] Hence, \[m=-3\]You need to login to perform this action.
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