A horizontal ray of light passes through a prism of refractive index 1.5 and apex angle $$4^\circ$$ and then strikes a vertical plane mirror placed to the right of the prism. If after reflection, the ray is to be horizontal, then the mirror must be rotated through an angle

A

$$1^\circ$$ clockwise

B

$$1^\circ$$ anticlockwise

C

$$2^\circ$$ clockwise

D

$$2^\circ$$ anticlockwise