AQA · Physics · 8463
GCSE Physics: Lenses
Waves · AQA GCSE Physics (8463), specification point 4.6.2.5. Cards are generated from the exam board's own specification for "Lenses", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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How does a lens form an image?
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By refracting light.
What happens to parallel rays of light passing through a convex lens?
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They are brought to a focus at the principal focus.
The distance from the lens to the principal focus is called the ?.
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focal length
Define the focal length of a lens.
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The distance from the lens to the principal focus.
Can the image produced by a convex lens be real or virtual?
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Either — a convex lens can produce a real or a virtual image, depending on where the object is placed.
The image produced by a concave lens is always ?.
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virtual
What is the equation for the magnification produced by a lens?
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magnification = image height ÷ object height
What are the units of magnification?
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None — magnification is a ratio of two heights, so the units cancel.
In which units should image height and object height be measured when calculating magnification?
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Both in mm or both in cm (the same unit for each).
What type of diagram shows how convex and concave lenses form images?
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A ray diagram.
An object 2 cm tall produces an image 6 cm tall. What is the magnification?
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3 (magnification = 6 cm ÷ 2 cm = 3, no units).
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