A light ray is incident normally on the face ab of a right angled prism abc as shown in the figure the largest value of angle θ, for which the light ray is totally reflected at the surface ac is.

a displacement distance is size of displ

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

the components of a vector are the parts of the vectors that are to each other.

b perpendicular