Question

two plane mirrors each 2√3m long are fixed parallel at a distance of 0.2m .A ray of light incidences at the starting of the the lower mirror with a angle of incidence of 30°. Then find total number of reflected rays between the mirrors. (Ans-30) ​

Answer 1

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❥after each reflection it travels 1cm (2nd reflection will occur after traveling 1cm), so at 100th reflection it will start its journey to complete that last cm and then reflect last time on the lower mirror to give 101th reflection before going out.

Answer 2

Answer in attachment:

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