As shown below, a slide projector is used to produce an image of an object on a

Question

As shown below, a slide projector is used to produce an image of an object on a screen.

If the imagine is focused by moving only the object, what should be the distance between the object and the lens os that the image is focused at the screen?

How large will the image appear on the screen when it is in focus?

Will the imagine of the tip of the arrow appear towards the top or the bottom of this page?

2. As shown below, a slide projector is used to produee an image of an object on a screen. 1f the image is focused by moving only the he image is foeused by moving only the object, what should bo the distance between the object and the lens so that the image is focused at the screen? f 4 cm 1 cm object screen 9 m vill the image appear on the screen when it is in focus? e of the tip of the arrow appear towards the top or the bottom of this pag

Explanation / Answer

distance between screen and lens,di= 9cm

distance between screen and object,do= ?

focal length,f= 4 cm

1/f=1/di+1/do

1/f=1/9+1/do

1/do=1/4-1/9=5/36

d0=7.2 cm

magnification,m=-do/di=-9/7.2=-1.25

Arrow will be down side. It produce real image

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