Q 10. Explain the following. (a) For diffraction experiment, why the grating is better than double slits? (b) After the total internal reflection, the light either follow the law of reflection or not? (c) In prism experiment how the angle of prism is measured? (d) In pinhole diffraction experiment, concentric fringes are observed why? (e) In Michelson interferometer, why we used the converging lens is used?