In which situation is maximum work considered to be done by a force

OR

                                W = F.S

                                W  = F. S cos Θ

When cos Θ = 0° ; cos 0 = 1

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

we need to know the time interval during which the force acts. impulse of force = momentum change