Which of the following statements is incorrect? 1) A ray of light travels from a point A to point B in a path that takes the shortest time

2) In reflection angle of incidence equal to angle of reflection

3) Magnification for a plane mirror is always unity

4) A plane mirror can form only virtual images

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force