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Question 21

From Physics HL Paper 1A (May 2025, TZ1)

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  1. Light of wavelength λ\lambda is incident on two parallel slits of width bb that are separated by distance dd.
    The graph of intensity against diffraction angle is shown.
Graph showing intensity against diffraction angle for light passing through two parallel slits.
Graph showing intensity against diffraction angle for light passing through two parallel slits.

What are λd\frac{\lambda}{d} and λb\frac{\lambda}{b}?

Table with four rows (A-D) and two columns for values of lambda/d and lambda/b.
Table with four rows (A-D) and two columns for values of lambda/d and lambda/b.

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