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23 Nov 2019

In a film apparatus, it is desired to produce pictures 12 feet wideon a screen 50 feet from the lens; the size of the picture on thefilm is one inch wide. What must be the focal length of theprojecting lens used?

Please Explain the answer. I want to know why not just the answer!!Thanks!

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Patrina Schowalter
Patrina SchowalterLv2
10 Jul 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

In a film projection apparatus, it is desired to produce pictures12 feet wide on a screen 50 feet from the lens; the size of thepicture on the film is one inch wide. What must be the focal lengthof the projecting lens used?

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A science museum has created ahuge concave mirror with a focal length of 5 m, and mounted it sothat it covers the entire wall at one end of a long hallway. If youstand on a center line painted down the middle of the hallway,you're on the mirror's principal axis. You and a friend arestanding on the center line, you're 8 m from the mirror, and yourfriend is 20 m from it. Can both you and your friend see the imageof you created by the mirror? Explain. (Don't worry about either ofyou blocking the other's line of sight – you both can crane yourheads as needed. The mirror is really, really big.)
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I TOOK A PIC OF THE ANSWER I TURNED IN
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THE INSTRUCTORS RESPONSE WAS:
Very good. Please include units when giving your results. As forthe image being behind you, couldn't you just turn around to seeit?

You don't need to find where your friend's image is, just figureout whether he'd be able to see your image or not. How do you knowhe can see your image?

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