A cockroach is flying towards a plane mirror in perpendicular direction with a velocity of 4 mm `s^(1)` . Find the speed of its image in the mirror and also find out the angle of incidence , angle of reflection and angle of deviation.

Answer

4 mm `s^(1)`, zero

Explanation

`V_(C)=4 "mm" s^(-1)`
Speed of the image of cockroach is equal to the spped of cockroach.
Image speed =4` mm s^(1)`
As its is approcahing the mirror perpendicularly , its angle of incidence=angle of reflection =zero
Angle of deviation `=180-2i`
`" "=180-0`
`" "=180^(@)`