Interactive practical

Interference: Young's slits and diffraction gratings

Measure double-slit fringes and matching diffraction orders, then determine and compare the wavelength of laser light using two methods.

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Practice: Interference: Young's slits and diffraction gratings

CCEA 1210 — this practical matches your selected course; the questions check the method, data handling and practical skills.

Check your answers as you work. For written questions, use the marking points to assess your response.

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6 additional questions require A-Level Physics Premium access.

2 of 2 available questions match the selected filters. This session contains 2 questions.

Question 1 · 1 mark · Foundation · Practical · Diagnostic

What is the equation for double-slit fringe spacing?

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Question 2 · 3 marks · Standard · Practical · Practical method

Explain why measuring across 10 fringes is better than measuring one.