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A square wire of side `3.0 cm` is placed `25 cm` away from a concave mirror of focal length `10 cm`. What is the area enclosed by the image of the wire ? The centre of the wire is on the axis of the mirror, with its two sides normal to the axis.A. 4 `cm^(2)`B. 6 `cm^(2)`C. 16 `cm^(2)`D. 36 `cm^(2)` |
Answer» Correct Answer - A (a) Linear magnification, `m=I/O=f/(u-f)=10/(25-10)` `m=10/15=2/3` A real magnification=`m^(2)=4/9` Area of image=`4/9xx`area of object =`4/9xx(3)^(2)=4 cm^(2)` |
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