A 50cm tall object is at a very large distance from a diverging lens . A virtual,erect and diminished image of the object is formed at a distance of 20cm in front of the lens . how much is the focal length of the lens
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Answered by
5
It's obvious from the relation,
, focal length is 20cm. Actually, -20cm to be more appropriate, according to the sign convention and all.
Alizina:
BUT how? can u explain it more elaborately?
i will explain u
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Actually, the focal length of lens is defined as "When an object is placed at infinity, the point where the image is formed is called its focus."
Distance from optical centre to focus is called focal length.
i know that but how these things are related to this numerical
by applyong which formula u have got this answer?
I've edited it. You can see the formula, right?
but we are given only v = -20cm in this question
Answered by
1
It's obvious from the relation,, focal length is 20cm. Actually, -20cm to be more appropriate, according to the sign convention and over all.
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