-A ray IA is incident at point A on mirror M1.After reflection at mirror M1, it is incident, respectively, at mirrors M2 and M3. Find the angle which the finally-reflected ray CR makes with the plane of mirror M3.
30°
40°
50°
60°
pls help

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c