Science, asked by potrri, 1 year ago

A concave lens of focal length 15 cm forms an image 10 cm from the lens .How far is the object placed from the lens ? Draw a ray diagram​

Answers

Answered by shyamameena
11

Given,

focal length, f = -15 cm

Distance of image, v = -10 cm

Distance of object, u =?

We know that,

1/v - 1/u = 1/f

So, 

1/-10 - 1/u = 1/-15

So, -1/10 + 1/15 = 1/u

(-3 + 2)/30 = 1/u

-1/30 = 1/u

Therefore u = -30 cm

Thus object is placed 30 cm away from the concave lens.


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Answered by visshu92
10

Answer:

hope it will help you.....

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