1201 Ho 4b av ap 20 0 SolutionNo The correct answer is 50deg

Solution

No, The correct answer is 50deg.

As you can see the normal of the body is perpendicular to the surface, i.e it makes an angle of 90deg with the surface.

And the a line divide the 90deg angle in two parts one of which is 40deg so the another angle will be 90-40=50deg which is required angle.