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10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    Two mirrors inclined to each other produces five images of an object placed between them. If the angle between them is reduced by \[30{}^\circ \], what will be the number of images seen in the two mirrors?

    A)  15                         

    B)         12

    C)  13                         

    D)         11  

    Correct Answer: D

    Solution :

                    \[n=\frac{360}{\theta }-1\] \[\therefore \]  \[5=\frac{360}{\theta }-1\] \[\Rightarrow \]               \[\theta ={{60}^{o}}\] On reducing the angle by\[{{30}^{o}}\], the new angle between the mirror becomes\[{{30}^{o}}\] Now,     \[\frac{360}{\theta }=\frac{360}{60}=12\] Since, this is an even number, number of images seen\[=12.1=11\].


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