A laser is seen in the lower left of the screen, pointed Up. Set the slider to the angle of incidence that the beam from the laser will strike the mirror (Top View). Click the green flag and the laser will turn through the angle of incidence and send a beam along a straight line (that's what lasers are good for). The light beam will strike the mirror and reflect off the mirror at an angle equal to the angle of incidence.
The law of plane reflection states that an object projected at a flat surface will reflect from that surface at an angle equal to the angle at which it hit the surface, as measured from a perpendicular, called the 'normal'. to the surface. The incident angle and reflected angle, as measured from the mirrored surface, are also equal. The normal is a useful line when dealing with reflection from a curved surface. Can you find where 'parallel lines cut by a transversal form equal opposite angles' is used in the script. Can you figure out why the reflected angles is 2 x (90 – angle of incidence)?
