Question

an object of size 10cm is placed at a distance of 15cm from the convex lens of 10 cm focal length.Find the position and size of the jmage​

Answer 1

Answer :

Height of object = 10cm

Distance of object = 15cm

Focal length = 10cm

Type of lens : convex

We have to find position and size of the image$.$

Focal length of convex mirror is taken positive.

★ Position of image :

➝ 1/v - 1/u = 1/f

• u = distance of object
• v = distance of image
• f = focal length

➝ 1/v - 1/(-15) = 1/10

➝ 1/v = 1/10 - 1/15

➝ 1/v = (3-2)/30

➝ v = 30 cm

★ Size of image :

➝ m = v/u = h'/h

• h' = height of image
• h = height of object

➝ 30/(-15) = h'/10

➝ -2 = h'/10

➝ h' = -20 cm

Negative sign shows that image is real and inverted.