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# physics: (1) in terms of focal length, how far is the camera

### Resolved Question:

physics: (1) in terms of focal length, how far is the camera from the film when very distant objects are being photographed?
Submitted: 5 years ago.
Category: Homework
Expert:  Angela--Mod replied 5 years ago.
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Customer: replied 5 years ago.

still waiting
Expert:  Donna-moderator replied 5 years ago.
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Expert:  Chris M. replied 5 years ago.

HelloCustomer

In terms of focal length, how far is the camera lens from the film when very distant objects are being photographed?

The relationship between the distance of a photographed object (p) and the focal length (f) can be expressed as follows:

(1/q) + (1/p) = (1/f)

Where 'q' is the image distance formed by the lens.

For very distant objects, 'p' becomes very large and (1/p) approaches zero, and the formula becomes:

(1/q) ≈ (1/f) or q ≈ f

The image for distant objects then forms approximately at the focal point and that is where the film is positioned. So, the distance from the film to the camera lens is approx. equal to the focal length.

Hope this helps!

Customer: replied 5 years ago.
hmm, ok, then for this question: if you take a photograph of you image in a plane mirror, how many meters away should you set your focus if you are 2 meters from the mirror?

I guess we could use the same formula and say that 1/f = 1/2 + 1/2 (since the image should be the same distance behind the mirror as the object is in front of it).

Is that correct?
Expert:  Chris M. replied 5 years ago.

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Chris M., M.S.W. Social Work
Category: Homework
Satisfied Customers: 2788
Experience: Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
Customer: replied 5 years ago.

thanks, XXXXX XXXXX you seem to be pretty good at this, here are three more questions for a \$50 bonus.

(3) can you photograph your self in a mirror and focus the camera on both your image and the mirror frame? explain
(4) why do you have to put slides into a slide projector upside down
(5) maps of the moon are actually upside down. why?

If you don't want to answer them, I understand, and I'll throw them open to the group. Also, I'm out of here tonight so won't be able to respond until tomorrow.
Expert:  Chris M. replied 5 years ago.

HelloCustomer

I just saw your reply. If you would, please make a new post of these questions. Not sure if I can provide a detailed enough answer for these.

Thanks