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A convceve lens of focal length 15 cm fo...

A convceve lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object from the lans ? Draw the ray diagram.

Text Solution

Verified by Experts

Focal length of concave lens (`OF_1`), f = -15 cm
Image distance, v= -10 cm
According to the lens formula,
`1/v-1/u=1/f`
`1/u=1/v-1/f=(-1)/(10)-(1)/((-15))=(-3+2)/(30)= - (1)/(30)`
u=-30 cm
The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the following ray diagram.
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