A) 7.5 cm
B) 6.55 cm
C) 3.7cm
D) 13.1cm
Correct Answer: B
Solution :
\[\theta =\frac{diameter\text{ }of\text{ }sun}{distance\text{ }of\text{ }sun}\] \[\theta =\frac{diameter\text{ }of\text{ }image}{focal\text{ }length\text{ }of\text{ }concave\text{ }mirror}\] \[\frac{1}{2}\times \frac{\pi }{180}=\frac{diameter\text{ }of\text{ }image}{7.5m}\] \[\therefore \]Diameter of image\[=\frac{\pi }{360}\times 7.5\,m\] \[=\frac{3.14\times 7.5}{360}\times 100\,cm\] \[=6.55cm\]
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