Question

a concave lens of focal length 15cm forms an image 10cm from the lens how far is the object placed from the lens? draw the ray diagram​

Answer 1

Answer:

the object is 30 cm away from the lens...

Explanation:

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.

sorry bro cant upload a picture