Lens - SGH
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Define power for a lens? | Power=1/focal length
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| What is the unit for power of a lens? | Dioptre, D
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| What is the lens formula? | 1/f = 1/u + 1/v
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| What kind of image is formed from a converging lens, when the object-to-lens distance is smaller than the focal length? | Virtual image
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| What are the differences between a real and virtual image? | A real image is inverted and can be formed on a screen, whereas virtual images are upright and cannot be formed on a screen.
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| For a converging lens, where must the object be placed to give a real image of the same size as the object? | At u=2f
because using: 1/f = 1/u + 1/v
when object-size=image-size, u must equal v
so you get 1/f = 1/u + 1/u = 2/u
therefore u = 2f
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Created by:
sandeep15
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