-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

the answer would be   dignified - apex

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

at right angles to each other

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it