just need the answers to b, e, and f. The rest i know are correct You have a sma

Question

just need the answers to b, e, and f.

The rest i know are correct

You have a small but bright computer display that is only 4 cm wide by 4 cm tall. You will place a lens near the display to project an image of the display about 2.1 m tall onto a large screen that is 9 m from the lens of the projector.

a Should you use a converging lens or a diverging lens?

converging

b) What should the focal length of the lens be? (Give your answer to at least two decimal places.)

c) Suppose that you choose a lens that has the focal length that you calculated in part (b). What exactly should be the distance from the computer display to the lens? (Give your answer to at least two decimal places.)

answer 17.1429

d. In order that the screen display be right side up, should the computer display be inverted or right side up?

answer inverted

On another occasion the screen is moved close, so that it is only 5 m from the lens. To focus the image, you have to readjust the distance between the computer display and the lens. What is the new exact distance from the computer display to the lens? (Give your answer to at least two decimal places.)

(f) How tall is the image on the screen, now that the screen is only 5 m from the lens?

Explanation / Answer

(b) We have    where f =focal length, I = image distance. W=image length, w=object lens

Here, I=900 cm, W=2.1 m and w=4 cm

So putting the values in above eqn. we get f=16.82 cm

(e) The focal length will be given by where O is object distance.

Here, I=500 cm, f is fixed value. So putting the values in eqn we get,

O=17.51 cm

(f) Image length is

Here I=500 cm, f is fixed value determined earlier, w=4cm

Putting the values we get,

W=1.149 m

Related Questions

Navigate

• Browse (All)
• Browse J
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.