An experiment is set up to determine the relationship between the DEGREE OF DIFFRACTION and WAVELENGTH of light. Blue light is passed through a single slit and the pattern formed is observed.
The experiment is now repeated with green light and then with red light. The distance between the light source and the slit remains constant during the investigation. The patterns obtained are shown in the diagram below.
7.1 Define the term wave front. (2)
7.2 What nature of light is demonstrated by diffraction? (1)
7.3 For this experiment, write down:
7.3.1 ONE controlled variable (1)
7.3.2 The independent variable (1)
7.4 Fully explain the difference in the patterns observed. (4)
7.5 The experiment with red light is now repeated using a NARROWER slit.
How will the broadness of the central band be affected? Write only INCREASES, DECREASES or REMAINS THE SAME. Give a reason for the answer. (2)
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