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Answer the following.
Student 1 and Student 2 conducted experiments using coherent sources of light, with Student 1 using…
Student 1 and Student 2 conducted experiments using coherent sources of light, with Student 1 using a single slit and Student 2 using a double slit.
Upon utilizing a monochromatic source of light of 500 nm wavelength, Student 1 observed that the distance between the initial minimum and the centre of the fringe matched the width of the slit. Calculate the distance of this initial minimum from the centre of the fringe, given that the screen is situated 1 m away from the slit.
Answer
Answer
Official answer keyDistance of the first minimum of the diffraction pattern from the centre, $y = \frac{\lambda D}{d}$
Let $y = d = x$
$x^2 = \lambda D = 500 \times 10^{-9} \times 1$
$x = 70.7 \times 10^{-5}$ m
Final answer: $70.7 \times 10^{-5}$ m
From ISC 2025 Practice Physics, question 92(c).
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