A-LevelBiologyCell structureMay/June 2015Paper 1 Q21 Mark
A specimen is viewed under a microscope using green light with a wavelength of 510 nm. If the same specimen is viewed under the same conditions, but using red light with a wavelength of 650 nm instead, what effect will this have on the magnification and on the resolution of the microscope?
Adecreased magnification, remains the same resolution
Bincreased magnification, increased resolution
Cremains the same magnification, decreased resolution
Dremains the same magnification, increased resolution
✓ Correct Answer
The correct answer is C: remains the same magnification, decreased resolution
📋 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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