P1.1 - Reflection and Refraction
- Created by: Lucinda.Khalil
- Created on: 15-11-15 17:20
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- P1.1 - Reflection and Refraction
- Light travels as waves, normally in straight lines unless it is reflected or refracted
- Reflection
- Reflection is a chnge in direction of a wave upon striking the interface between two materials
- Diagram
- Incident ray - ray or light that strikes a surface
- Refraction
- Light slows down when entering a denser object
- E.g: air and glass
- Causes the light to change direction
- Light bends towards to normal when entering denser material
- Angle of refraction - the angle made by a refracted ray with the normal
- Diagram
- There is slight reflection at points where the density changes (glass block)
- When a ray enters a denser medium it bends toward the normal
- When entering a less dense object, the rays bends away from the normal
- Light slows down when entering a denser object
- Refraction
- Normal - line perpendicular to surface
- Refraction
- Light slows down when entering a denser object
- E.g: air and glass
- Causes the light to change direction
- Light bends towards to normal when entering denser material
- Angle of refraction - the angle made by a refracted ray with the normal
- Diagram
- There is slight reflection at points where the density changes (glass block)
- When a ray enters a denser medium it bends toward the normal
- When entering a less dense object, the rays bends away from the normal
- Light slows down when entering a denser object
- Refraction
- Angle of Reflection - the angle made by a reflected ray with the normal
- Angle of reflection = angle of incidence
- Finding the focal langth
- Diagram
- How to find the focal point of a lens
- Use lens to focus parallel rays of light from distant object onto a screen/piece of paper
- Rays of light will meet at paper to form a real, inverted image.
- Move lens until image is focused
- The focal length is the distance between lens and paper
- The focal point is the point where all the parallel rays are brought together
- Lenses
- Converging lenses makes rays of light come together
- A converging lens can be used as a magnifying glass if it is held close to an object
- This produces a virtual image because the rays of light only appear to be coming from it
- It is also magnified and the right way up
- This produces a virtual image because the rays of light only appear to be coming from it
- A converging lens can be used as a magnifying glass if it is held close to an object
- The fatter the lense the shorter the focal point
- The magnification of an image depends on:
- Focal length
- Distance between object and lens
- Converging lenses makes rays of light come together
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