Physics IGCSE lenses and the eye
- Created by: Penny
- Created on: 15-11-12 16:38
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- Lenses and the eye
- Lens form a image by refracting light
- Concave lens
- Parallel rays of light diverge as if coming from the principal focus
- Also called a diverging lens
- Parallel rays of light diverge as if coming from the principal focus
- The focal length of a lens is determined by:
- the refractive index of the material from which the lens is made
- the curvature of the two surfaces of the lens
- The greater the refractive index the flatter the lens
- Concave lens
- Convex lens
- Parallel rays of light are bought to a focus
- The principal focus
- Also called a converging lens
- object distance, U, image distance v and focal length f
- 1 over U + 1 over v + 1 over f
- Parallel rays of light are bought to a focus
- Nature is defined by its size relative to the object
- upright or inverted relative to the object
- Real or virtue
- Lens form a image by refracting light
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