I'm not sure on any of these answers please help me.

1. The drawings show two examples in which a ray of light is refracted at the interface between two liquids. In each example, the incident ray is in A A liquid A and strikes the interface at the same B angle of incidence. The dashed lines denote the normals to the interfaces. Rank the indices of refraction of the three liquids in descending order (largest first). 1.5 points A. nA, NB, nc, B) nc, nA, nB, C) nB, nc, NA, D) nB, nA, nc 2. A positive charge is moving to the right with the speed v in the region of B the magnetic field that is pointing upward along the plane as shown in the figure. The force on the charge will be directed, [1.5 points] A) out of the plane B) into the plane C) towards right D) towards left Q 3. An electron enters a region of a uniform magnetic field and follows a circular path. The magnitude of the magnetic field is 0.01 T, and the radius of the path is 2 cm. What is the speed of the electron in the region of the field? [Mass of the electron=9.11x 10-31 kg] A) 1.7x107 m/s B) 1.2x107 m/s C) 2.3x107 m/s D) 3.5x107 m/s