Given below are two statements: Statement-I: In the case of Fresnel's biprism, coherent sources are produced by the phenomenon of refraction. Statement-II: In the case of Lloyd's mirror, coherent sources are produced by the phenomenon of reflection. In the light of the above statements, choose the correct answer from the options given below.

In interference and diffraction, light energy is redistributed. If it reduces in one region (dark fringe), it increases in another region (bright fringe). A. As there is no net gain or loss of energy, these phenomena are consistent with the principle of conservation of energy. B. Diffraction and interference are characteristics exhibited only by light waves. Choose the correct option:

Two waves of intensity I and 4I produce a resultant intensity of 5I in an interference experiment. What is the phase difference between the two waves?