Question

If an object of 7m height is placed at a distance of 12cm from a convex lens of focal length 8cm ...find the position ,nature and height

Answer 1

The object is placed between 2f and f so the image thus formed will be beyond 2f.
Image formed will be real and inverted.

Answer 2

Answer:

Given f=-8 cm

U=12cm

Height of object = 7m

Now,

W.k.t 1/f+1/u = 1/v

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

-3+2/24 = 1/v

-1/24= 1/v

V =-24 cm

W.k.t hi/ho= -v/u

Hi/7= -(-24)/-12

Hi/7 = -2cm

Hi= 14 cm

The object is between center of curvature and focus so image is obtained beyond center of curvature

Real inverted magnified

Explanation: