Question

If the object is placed at a distance of 12cm from conven lens of focal length


8cm. The image distance will be
(a) 12 cm (b) 24 cm
(c) 36 cm
(d) 48 cm
​

Answer 1

Answer:

1/f-1/u+1/v

u=-12

f-8

1/-8+1/12-1/v

-12+8/96-1/v

-4/96-1/v

-24-v

-24cm in front of the mirror

Real, inverted and magnified

Step-by-step explanation:

24 cm is the correct answer

Answer 2

Answer:

Focal length of convex lens,  f=8 cm

Object distance,  u=−12 cm

Using lens formula    v1−u1=f1

where v is the image distance.

∴  v1−−121=81

⟹ v=+24 cm

(+ve sign indicates that image is formed behind the lens)

Hence the image formed is real and inverted.

Step-by-step explanation:

hope it help