Question

In an experiment to investigate the diffraction of light by a single slit, a narrow parallel beam of light is passed through a narrow slit before it falls on a screen some distance away. Which ofthe following statements is/are correct? 1. If the slit width is reduced, the total light energy falling on the screen is decreased, but the width of the central diffraction band will be increased. 2. If the light source is replaced by one producing light of a longer wavelength, the central diffraction band will be broader 3. If the light source is replaced by an intense source of white light, the edges of the central diffraction band will be coloured A. 1,2,3 all correct B. 1,2 only correct C. 2,3 only correct D. 1 only correct E. 3 only correct

Answer 1

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