Lenses & Images
- Created by: Jo Wells
- Created on: 24-04-13 20:39
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- Lenses & Images
- converging lens = convex
- causes parallel rays of light to converge at the principal focus
- principal focus = where rays meet
- diverging lens = concave
- causes parallel rays of light to diverge
- principal focus = where rays appear to meet up
- axis of a lens is a line passing through middle of lens
- is a principal focus either side of lens
- distance from centre of lens to principal focus = focal length
- 3 rules for refraction in lenses
- diverging
- an incident ray parallel to axis refracts through lens & travels in line with principal focus (appears to have come from principal focus)
- an incident ray passing through lens towards principal focus refracts through lens & travels parallel to the axis
- an incident ray passing through centre of lens carries on in same direction
- converging
- an incident ray parallel to axis refracts through lens & passes through principal focus on other side
- an incident ray passing through principal focus refracts through lens & travels parallel to axis
- an incident ray traveling through centre of lens carries on in same direction
- diverging
- real images
- forms an image on a 'screen'
- virtual images
- rays = diverging, so light from object appears to be coming from a completely different place
- e.g. mirror - face appears to be behind mirror = isn't
- e.g. magnifying lens - image looks bigger than object is = isn't
- rays = diverging, so light from object appears to be coming from a completely different place
- converging lens = convex
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