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 Community Discussion Question:
device
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Mar 2008 19:13:36 IST
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device whose focal lenght cannot be obtained directly is a) concave mirror b) concave lens c) convex mirror d) convex lens
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25 Mar 2008 19:14:57 IST
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b,c
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25 Mar 2008 19:15:22 IST
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i think that shd be the ans bcos they cant form images on the screen :)
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25 Mar 2008 19:38:31 IST
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is dat a,c?
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25 Mar 2008 19:43:06 IST
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no b, c is the answer
as concave lens and concave mirror dont form real images(unless ofcourse for a virtual object) u cant find their focal length directly.
u use a convex lens to find the focal length of concave lens- a common lab activity..
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25 Mar 2008 19:59:52 IST
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i c thnx for correction...........
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26 Mar 2008 10:25:53 IST
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ya we find rough focal length by making an image on screen where image is sharper is the rough focal lengh so is the image is virtual focal length can't be obtained
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26 Mar 2008 10:27:44 IST
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so the ans goes b , c
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