A room (cubical) is made of mirros. An i...

A room (cubical) is made of mirros. An insect is moving along the diagonal on the floor such that the velocity of image of insect on two adjacent wall mirrors is `10(cm)/(sec)`. The velocity of image of insect in ceiling mirror is

`10 cms^(-1)`

`20 cms^(-1)`

`(10)/(sqrt2) cms^(-1)`

`10 sqrt2 cms^(-1)`

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