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Summary: Light And Lenses
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Read the summary and the most important questions on Light and Lenses
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1 Light and Lenses
This is a preview. There are 14 more flashcards available for chapter 1
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How does a lens form an image?
By refracting light -
What is focal length?
The distance between the lens and the principle focus -
How do you describe an image?
By referring to its size, whether it's upright or inverted and whether it's real or virtual in comparison to the object -
For a diverging lens, how do light rays act?
From top of object parallel to axis - As if it came from the focal point
Straight through the middle of the lens - Does not change -
What is the optic nerve?
What carries nerve impulses from the eye to the brain -
What are the ciliary muscles?
What causes the lens to fatten/thin -
How do cameras work?
Like an X-ray, the light hits film/ a CCD and produces an image. However, a camera has a lens to focus the light and the opening can be changed to allow different amounts of light in. -
What is the focal length determined by?
The refractive index of the material and the thickness of the lens -
What causes short sightedness?
Too long of an eyeball, lens too thick -
What is the unit for the power of a lens?
Dioptres
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