Question

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Answer 1

Explanation:

1--There are two laws of reflection.......

I)++ Laws of reflection states that --//--

First law /- The incident ray , the reflected ray and the normal ,all lie in the same plane.

Second law /- The angle of reflection is equal to angle of reflection.

ii) We know that ,

-/ Angle of reflection = Angle of incidence

Hence, according to the question..........

Angle of reflection + Angle of incidence = 120°

Angle of incidence+ Angle of incidence = 120°

( Because, Angle of reflection = Angle of incidence )

Or, 2 (Angle of incidence )= 120°

Or, Angle of incidence = 120°/2

Or, Angle of incidence = 60°

Hence,Angle of incidence is equal to 60° .

Sorry,But I can't answer no 2 as I have some important work..........