School Physics Notes: OPTICS: physics of lenses and correction of eye defects

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OPTICS - types of lenses, uses and ray diagrams all explained and the correction of eye defects

Doc Brown's GCSE level Physics  study revision notes

Sub-index for this section on optics - lenses (F = focal length of a convex lens)

1. Reminders of what happens when light rays pass through different shaped prisms

2. The types and properties of lenses, how to construct ray diagrams, measurement of focal length F

3. Convex lens ray diagram for a real image when object is a distance of 2F from the lens

4. Convex lens ray diagram for a real image if object is a distance between F and 2F from lens

5. Convex lens ray diagram for virtual image when object is at a distance between F and lens

6. Convex lens ray diagram for when object is at a distance beyond 2F

7. Ray diagram for a concave lens showing the divergence of parallel rays

8. Ray diagram showing the formation of a virtual image by a concave lens

9. Eye defects  - explaining short sightedness and long sightedness - correction using lenses

See also The eye (gcse biology notes)

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WAVES - electromagnetic radiation, sound, optics-lenses, light and astronomy revision notes index

General introduction to the types and properties of waves, ripple tank expts, how to do wave calculations

Illuminated & self-luminous objects, reflection visible light, ray box experiments, ray diagrams, mirror uses

Refraction and diffraction, the visible light spectrum, prism investigations, ray diagrams explained

Electromagnetic spectrum, sources, types, properties, uses (including medical) and dangers

The absorption and emission of radiation by materials - temperature & surface factors including global warming

See also Global warming, climate change, reducing our carbon footprint from fossil fuel burning

Optics - types of lenses (convex, concave, uses), experiments and ray diagrams, correction of eye defects

The visible spectrum of colour, light filters and explaining the colour of objects

Sound waves, properties explained, speed measure, uses of sound, ultrasound, infrasound, earthquake waves

The Structure of the Earth, crust, mantle, core and earthquake waves (seismic wave analysis)

Astronomy - solar system, stars, galaxies and use of telescopes and satellites

The life cycle of stars - mainly worked out from emitted electromagnetic radiation

Cosmology - the Big Bang Theory of the Universe, the red-shift & microwave background radiation


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