Question

OR
Aconcave lens of focal length 15 cm forms an image 10 cm from the lens. How
far is the object placed from the lens? Find the magnification produced by the
lens. With the help of this mention the nature of the image.​

Answer 1

Answer:

so the object is placed 30 cm away from the concave lens

Answer 2

Explanation:

f = -15 cm

v = -10 cm

Lens formula: 1/v – 1/u =1/f

1/-10 – 1/u = 1/-15

1/u = - (1/10) + 1/15

1/u = -2/60

u = -30 cm

Object is at 30 cm from the concave lens (on left side).

$--- \:See \:the\: diagram\: ---$

Here, OB = 30 cm

OF = 15 cm

OB’ = 10 cm