Two forces F1 and F2 applied on a crate/box lying on a frictionless ,horizontal surface as shown in the diagram The magnitude of force is greater than that of force F2. Describe the state of motion of the crate

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90