Question

At what distance from concave lens of focal length 25 cm a 10 cm tall object to be placed so as to obtain its image at 20 cm from the lens. Also calculate the size of the image formed. ​

Answer 1

Answer:

Given:

f = 20cm

o = 6 cm

v = 15 cm (image distance)

1\v -1\u = 1\f

1\15 - 1\u = 1\20

1\u = 1\15- 1\20

1\u = 1\60

I\O = V\U

I = 15 × 6 \ 60

I = 1.5 cm

Hope it helps!!

Answer 2

Explanation:

your answer is 1.5.

hope it helped