Question

two plane mirrors are incline at 70 degree.a ray incident on one mirror at angle theta after reflection falls on the second mirror and is reflected from there parallel to the first mirror,thetha is

Answer 1

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Answer 2

I think that is your problem. Please find the relationship between \[\epsilon \] and \[\theta \]
using geometrical theorems, then add the furthermore relationship:
\[\epsilon=\theta \]
(even if I don't know how to explain that last equality, nevertheless I think is right)
then solve the resultant system of equations, and get the values for theta and epsilon.