Question

Please answer this attachment

Answer 1

Answer:

Explanation:

1/v -1/u = 1/f

1/v = 1/f + 1/u

1/v = 1/20 - 1/18

1/v = 9-10/180

1/v = -1/180

v = -180cm

now,

v/u = h'/h

180/18 = h'/h

h' = 10h

∴ the image is 18 times the size of the object.

The image is virtual and erect.

2.) m = v/u

     m = -180/-18

     m = 10

Answer 2

Hope it helps you.......