Physics (AS & A Level) · Oct / Nov 2025 · Paper 54 · Question 2
9702
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The question as text
A student places a slide with a double slit on a support clamped to the bench as shown in Fig. 2.1. D light bench slide with double slit supports screen Fig. 2.1 The distance between the slide and the screen is D. The separation s of the slits is determined. Light from a laser is incident normally on the double slit. An interference pattern is observed on the screen. The distance w across 10 fringes is measured. The distance y between the centres of adjacent fringes is calculated using the equation y = w 10. The experiment is repeated with slides of different slit separation s. It is suggested that y and s are related by the equation λ = sy D where λ is the wavelength of the incident light. 1
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2(a)[1]
2(b)[2]
2(c)(i)[2]
2(c)(ii)[2]
2(c)(iii)[2]
2(d)[1]
2(e)(i)[2]
2(e)(ii)[1]
2(f)[2]
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