Question

an object is placed at a distance of 30 cm from a convex lens of focal length 20 cm . find the position of image​

Answer 1

Explanation:

f = focal length

u = position of object

v = position of image

given:

f = 20cm

u = 30cm

we know that:

formula of lens;

1/v - 1/u = 1/f

1/v = 1/f + 1/u

1/v = 1/-20 + 1/-30

1/v = 3-2/60

1/v=1/60

therefore V= +60cm

Answer 2

Answer:

An object is placed at a distance of 30 cm from a convex lens of focal length 20 cm. Image distance, v = ? v=60010=60 cm. The image is formed 60 cm on the other side of the lens and it is real, inverted and magnified