White light consists of many wavelengths. The wavelength of red light R is approximately twice the wavelength of violet light V. When white light is incident normally on a diffraction grating, several spectra can be formed. Which diagram shows the possible distributions of light in the first order and the second order spectra?
✓ Correct Answer
The correct answer is C: Diagram C showing two spectra, the first order with violet and red, and the second order also with violet and red. The red end of the first order spectrum appears to align with the violet end of the second order spectrum, with the second order spectrum being wider.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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