GiveMeThatIceCreamidn
Answered

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a converging lens with an 18 cm. focal length is used for a lens of a projector. if a film is placed 20 cm. away from the lens, how far must the screen be placed from the lens?​

Sagot :

Christenporch654idn

Answer:

The focal length of a slide projector’s converging lens is 10 cm.

a. If a 35 mm slide is positioned 10.2 cm from the lens, how far away must the

screen be placed to create a clear image?

b. If the height of a dog on the slide film is 12.5 mm, how tall will the dog’s image

on the screen be?

c. If the screen is then removed to a point 15 m from the lens, by how much will the

separation between film and lens have to change from part “a”?

di = -15 cm (negative b/c its virtual)

M = ¼ (must be smaller in diverg. lens)

hi = 2.5 cm (positive b/c its upright)

di = 5.26 cm or 52.6 mm (very close to primary focus)

hi = -1.316 cm (negative b/c its inverted)

To burn the paper, you must get a REAL image of the sun to form

on the paper. Since the sun is VERY far away, this image will

appear VERY close to the primary focus. Therefore, di = 20 cm.

di = 510 cm or 5.1m (far away from the film projector)

hi = -62.5 cm (film projectors make the object on the film BIGGER)

New do is 10.07 cm. Old do was 10.2 cm. The difference b/w the

two is .13 cm or 1.3 mm.

Explanation:

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