Light is incident along the normal to face ab of a glass prism of refractive index 1.54. find αmax, the largest value the angle α can have without any light being refracted out of the prism at face ac if the prism is immersed in water (with index of refraction 1.33). express your answer in degrees. ignore any reflections from the surface bc.

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?