A standard 35mm slide measures 24mm by 36mm. Suppose aslide projector produces a

Question

A standard 35mm slide measures 24mm by 36mm. Suppose aslide projector produces a 60cm by 90cm image of the slide on ascreen. The focal length of the lens is 12cm. a. What is the distance between the slide and thescreen? b. If the screen is moved farther from the projector shouldthe lens be moved closer to the slide or farther away? A standard 35mm slide measures 24mm by 36mm. Suppose aslide projector produces a 60cm by 90cm image of the slide on ascreen. The focal length of the lens is 12cm. a. What is the distance between the slide and thescreen? b. If the screen is moved farther from the projector shouldthe lens be moved closer to the slide or farther away?

Explanation / Answer

Let S1 be the distance fromslide

and S2 be the image distance

We know that 1/S1 + 1/S2 =1/f

And magnification = - S2/S1

but magnification here = 60/2.4 =90/3.6 =15/6 =50/2

So, f/ (f-s1) = 50/2 ...So, S1=11.52cm and S2 =288cm

a) distance= 288-11.52 = 276.48cm

b)Screen SHould be moved towards the slide..

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