A convex length 15cm forms image 10 cm from the lens how far the object place from the lens draw diagram
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Focal length (f ) = -15 cm
Distance of image (v) = -10 cm
1v–1u=1f
1/u = -(1/10) – (1/- 15)
1/u =1/15 – 1/10
1/u = -0.033
u = -30 cm
so the object is placed 30 cm away from the concave lens.
Ray diagram
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