A) 4.0 cm2
B) 4.5 cm2
C) 9.0 cm2
D) 20.25 cm2
Correct Answer: A
Solution :
\[\text{Magnification =}\frac{\text{size of image}}{\text{size of object}}\] Given, size of object = 3 cm \[\text{Magnification}=\frac{f}{u-f}\]where, \[f\] is focal length and u is object distance. \[\therefore \] \[m=\frac{10}{25-10}=\frac{10}{15}\] \[\therefore \] Size of image \[=m\times \]size of object \[=\frac{10}{15}\times 3=2\,cm\] Area of image \[={{(side)}^{2}}\] \[={{(2)}^{2}}=4\,c{{m}^{2}}\]You need to login to perform this action.
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