Science, asked by zeenusandhu, 7 months ago

A concave lens has focal
length of 15 cm. At what
distance should the object
from the lens be placed so
that it forms an image at 10
cm from the lens?

Answers

Answered by avniprajapati1987
2

Answer:

Hey there, this is ur answer......

Explanation:

Here, focal length of concave lens, f=-15cm. object distance, u=?, image distance, v=-10cm, magnification of lens, m=? Thus the object should be placed at a distance of 30 cm on the left side of the concave lens.

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Answered by deve11
5

Explanation:

Given: Concave lens, f=-15cm, v=-10cm

To find: u=?

Formula:

 \frac{1}{v}  -  \frac{1}{u}  =  \frac{1}{f}

 =  >  \frac{1}{ - 10}  -  \frac{1}{u}  =  \frac{1}{ - 15}

 =  >  \frac{1 \times 3}{ - 10 \times 3}  +  \frac{1 \times 2}{ 15 \times 2}  =  \frac{1}{u}

 =  >  \frac{ - 3}{30}  +  \frac{2}{30}  =   \frac{ - 3 + 2}{30}  =  \frac{ - 1}{30}  =  \frac{1}{u}

u =  - 30cm

The object should be placed at a distance of 30cm from the lens.

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