Question

An object is placed at a distance of 50cms from conves lens of focal length 20cm.find the nature and position of the image.

Answer 1

u = - 50 cm
f = 20 cm
1/v - 1/u= 1/f
1/v + 1/50 = 1/20
1/v = 1/20 - 1/50
1/v = 3/100
v = + 100/3
v = + 33.33
The image is on the right side of the lens and is real and inverted.

Answer 2

u = - 50 cm
f = 20 cm
1/v - 1/u= 1/f
1/v + 1/50 = 1/20
1/v = 1/20 - 1/50
1/v = 3/100
v = + 100/3
v = + 33.33
The image is on the right side of the lens(because "v" is positive) and is real and inverted.