This exam tips covers Exam Tips within Lenses & Images for GCSE Physics. Revise Lenses & Images in Waves for GCSE Physics with 13 exam-style questions and 15 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 13 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 13 of 14
Practice
13 questions
Recall
15 flashcards
💡 Exam Tips
🎯 Common Question Types:
- Complete a ray diagram for a convex lens (3 marks)
- Describe the image formed in terms of type, orientation, and size (3 marks)
- Calculate magnification from image/object heights (2 marks)
- Explain how lenses correct vision problems (Higher, 4 marks)
📝 Key Command Words:
- Draw: Show three rays correctly with arrows, mark image position
- Describe: State real/virtual, upright/inverted, magnified/diminished
- Explain: Describe what the lens does to the ray and why (refraction)
- Calculate: image height ÷ object height, no units needed
⚠️ Common Mistakes to Avoid:
- Forgetting to draw arrows on ray diagram lines (marks deducted)
- Giving only one characteristic when "describe" asks for the image (always give all three)
- Saying virtual images cannot be seen — they CAN be seen, just not projected
- Confusing convex (converging) with concave (diverging)
Quick Check: What type of lens would you use to correct short-sightedness, and why?
A concave (diverging) lens. In short-sightedness, the eye lens is too powerful and focuses images in front of the retina. A concave lens diverges the light rays before they enter the eye, reducing the effective power of the optical system so the image is focused correctly on the retina.
Keep building this topic
Read this section alongside the surrounding pages in Lenses & Images. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Lenses & Images
What does a convex (converging) lens do to parallel rays of light?
Explain the difference between a converging lens and a diverging lens. Include what each type does to parallel rays of light.
Quick Recall Flashcards
13 questions on Lenses & Images — practise free
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