46) a) When an obstacle comes in the way of light rays , rays of light bend and (a) distinct shadow seen on screen, this phenomenon is called diffraction of light. (b) On the basis of distance between source of light and screen, diffraction is classified as Fresnel and Fraunhofer diffraction. 1) a and b correct. 2) a correct , b incorrect 3) a and b incorrect 4) a incorrect , b correct

Correct answer: A