The image of an object placed in front of a concave lens is formed at 10 cm. If the focal length of lens is 15cm then calculate distance of object from lens.
Given
Distance of image from concave lens = -10cm (as in case of concave lens, image is always virtual)
Focal length of concave lens = -15cm (focal length of concave lens is always negative)
Formula used
Lens Formula
Using lens formula
U = -30cm
The distance of object from the lens is 30cm
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