Question

please solve this question

Answer 1

Draw a normal ( C) . It divided the reflected and incident angles.

According to Laws of reflection, Angle of Incidence = Angle of Reflection..

Now, Given Angle of Incidence + Angle of reflection ( Angle P OP¹)= 140°

Let the angle of incidence be x.

so, Angle of reflection = x

x + x = 140

2x = 140

x = 70°

So, Angle of Incidence = Angle of reflection, 70°

Now, We know that Normal divides the plane into two half's making a right angle.

Now, POA + Angle of incidence ( POC) = 90°

POA = 90 - 70 = 20°

Therefore, Correct option is Option ( A) 20°

Answer 2

this may help you and i had written R in place of P'