two plane mirrors M1 amd M2 each have length 1m and are seperated by 1cm .a ray of light is incident on one end of mirror M1 at an angle 45 degree.how many reflections the ray will have before going from the other end?

Using tan 45 in triangle AOB, we get AB = 1 cm.
Each reflection occurs at a distance of 1 cm
The total length is 1 m = 100 cm
taking first reflection at 0 cm, there will be total 101 reflections.


 

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