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Reflection

A plane mirro...

Question

A plane mirror of length $8 c m$ is moving with speed of $3 m / s$ towards a wall in situation as shown in figure. Size of spot formed on the wall is $32 / x c m$ . Find the value of x.

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Solution

Size of the spot $A B^{^{'}} = 4 + 12 = 16 c m$
Therefore $\frac{32}{x} = 16$
$x = \frac{32}{16} = 2 c m$

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