Question

at what distance from concave lens of focal lenght of 20 cm a 6 cm tall object be placed so as to obtain its obtain its image at 15 cm from the lens. also calculate the size of image formed ​

Answer 1

Answer:

5

Explanation:

fat

Answer 2

Answer:

Heyy ...

Explanation:

F = 20

Ho = 6 cm

V = - 15 ( Image formed by concave Mirror is virtual)

Using LENS FORMAL,

1/f = - 1/u+1/V

1/15 - 1/u=1/20

1/u = 1/15 - 1/20

1/u=1/6

I/O = V/U

I = 15 × 6/60

I = 1.5 cm

Hope its helpful...