GCSE Science | Lenses
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What is the focal point?
- the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.
What is focal length?
- The distance from the lens to the principal focus is called the focal length
What is a concave lense?
- caves inwards
- thinner at the centre and thicker at the ends
- parallel rays of light are made to diverge (spread out) from a point
- also called a diverging lens
- usually used to magnify an image
What is a convex lense?
- thicker at the centre and thinner at the ends
- parallel rays of light are made to diverge (spread out) from a point
- also called a converging lens
- usually used to magnify an image
Images
- real (can be seen behind the lens) or virtual (cannot be seen behind the lens)
- upright or inverted
- magnified or diminished