Year 11 - Science
Scale diagrams for convex lenses
Electromagnetic waves
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores reflection, refraction, and lenses using ray diagrams. It covers the electromagnetic spectrum, light as a wave, absorption, transmission, and practical uses. Emphasis is on risks, temperature balance, data presentation, and unit conversions.
Lesson Summary
You will learn to describe uses of convex lenses and draw scale ray diagrams to determine the position of an image.
Key Notes
- In cameras and the human eye, the required image distance < the object distance. The image is diminished and inverted.
- In projectors, the required image distance > the object distance. The image is magnified and inverted.
- A ray incident on a convex lens parallel to the principal axis is refracted to pass through principal focus.
- A ray incident on the centre of a convex lens is not refracted.
- A ray incident on a convex lens from the principal focus is refracted so it becomes parallel to the principal axis.
Vocabulary To Learn
- object distance: The object distance is the distance between an object and a lens.
- image distance: The image distance is the distance between a lens and an image formed by that lens.
- principal focus: The principal focus is the point to which parallel rays (from distant objects) are focused.
- focal length: The focal length is the distance between the centre of a lens and the principal focus.
- principal axis: The principal axis is a line through the centre of a lens, 90° to the optical axis of the lens.
Common Mistakes To Avoid
- Covering over half of a lens will block out rays of light from half the object and the image will appear cut in half.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
In cameras and the human eye, the required image distance < the object distance. The image is diminished and inverted. In projectors, the required image distance > the object distance. The image is magnified and inverted.
2. Define this scientific word and use it in context. 'object distance'
The object distance is the distance between an object and a lens. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Covering over half of a lens will block out rays of light from half the object and the image will appear cut in half. Correction: Talk about many rays of light passing through the lens from each point of the object and show pupils that blocking half the lens keeps the same image, only less bright.
More Lessons In This Unit
- Absorbing infrared radiation practical Study Guide
- Converging lenses Study Guide
- Convex lenses Study Guide
- Convex lenses (including magnification) Study Guide
- Dispersion of light and electromagnetic radiation Study Guide
- Dispersion of light and electromagnetic waves Study Guide
- Emitters of infrared & black body radiation Study Guide
- Emitting infrared and black body radiation Study Guide
- Emitting infrared radiation Study Guide
- Ionising electromagnetic radiation Study Guide
- Light and colour Study Guide
- Non-ionising electromagnetic radiation Study Guide
- Non-ionising electromagnetic radiations Study Guide
- Reflection of light Study Guide
- Reflection of light (including specular and diffuse) Study Guide
- Refraction through a rectangular block Study Guide
- Refraction through a rectangular block (including wave front diagrams) Study Guide
- Refraction through a semicircular block Study Guide
- Refraction through a semicircular block (including TIR) Study Guide
- Scale diagrams for converging lenses Study Guide
- Scale diagrams for convex lenses (including magnification) Study Guide
- The spectrum of electromagnetic radiation Study Guide
- The spectrum of electromagnetic waves Study Guide
- Virtual images from converging and diverging lenses Study Guide
- Virtual images from convex and concave lenses Study Guide
- Virtual images from convex and concave lenses (including magnification) Study Guide
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