An object is placed 80 cm from a screen. Aha point from the object should a conv

Question

An object is placed 80 cm from a screen. Aha point from the object should a converging lens with a focal length of 20cm be placed so that it produces a sharp image on the screen
What is the image magnification An object is placed 80 cm from a screen. Aha point from the object should a converging lens with a focal length of 20cm be placed so that it produces a sharp image on the screen
What is the image magnification Aha point from the object should a converging lens with a focal length of 20cm be placed so that it produces a sharp image on the screen
What is the image magnification

Explanation / Answer

u + v = 80 ----------------------------------------------------------1

apply 1/f = 1/u +1/v

f = uv/(u+v)

uv = 20 *80 = 1600

sop (u-v)^2 = (u+v)^2 -4uv

u-v)^2 = 80*80-(4*1600)

u -v = 0 ----> u =v

as u+v = 80

2u = 80

u = 40 cm

and v = 40 cm

magnification m = v/u = 1

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