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Question

A plane mirror is approaching you at $$10 cm/s.$$ You can see your image in it. The image will approach you with a speed of :


A
5cm/s
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B
10cm/s
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C
15cm/s
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D
20cm/s
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Solution

The correct option is D $$20 cm/s$$
In a plane mirror if the mirror moves at speed of $$v$$, then the image moves at a speed of $$2v$$.

So, in this case, as mirror is moving at a speed $$10\ cm/s$$, the image will move at a speed of $$(2)\times (10)cm/s$$ $$=20cm/s$$

Physics
NCERT
Standard XII

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