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?
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Hey You ❤
Your Answer :--
Given :
Focal length of concave lens, f = - 15 cm
Image distance, v= - 10 cm
Lens Formula :
According to the lens formula,
1/v - 1/u = 1/f
1/u = 1/v - 1/f
1/u = -1/10 - ( -1/15)
1/u = -1/10 + 1/15 = -5/150
u = - 30 cm
The negative value of u indicates that the object is placed 30 cm in front of the lens.
Note : For Ray Diagram please see attached file :)
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