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I am 28 yrs old and have already lost 2 babies, I want to know if it is possible to have healthy baby even though I have been diaignosed with Focal segmental glomular sclerosis! Or if I just not even consider it!

I’m not even sure what that is. I would ask this question under the Women’s health category as well. Maybe someone there will have better answers for you. Did your doctor tell you it was possible? Sorry for your losses.

Can you please explain a experiment, that can be carried out without any cost, that will determine the focal point of a concave mirror.

Try with a spoon. Start far away from your face, and watch your image as you bring the spoon toward yourself. The image will be inverted. When the image flips, your face is at the focal point of the mirror.

For an assignment I have, I need to take a picture and use a color focal point and make everything in the back, black and white. And leave the flower or object of interest as a color, I know I can do that on myspace, but how. And it has to be really precise. Like where I can go in with a drawing tool and mark what I want colored.

Download a copy of the Gimp. (it’s free)
http://download.cnet.com/GIMP/3000-2192_4-10073935.html

Follow this tutorial
http://www.gimp.org/tutorials/Selective_Color/

A 30.6 cm focal-length converging lens is 20.0 cm behind a diverging lens. Parallel light strikes the diverging lens. After passing through the converging lens, the light is again parallel. What is the focal length of the diverging lens? (Hint: First draw a ray diagram.)

Diagram:
http://a323.yahoofs.com/mbl/pics426632/426632.jpg?mlAI.sLBvh19auKM

Let f be the unsigned focal length of the diverging lens.
The diagram shows parallel light entering the diverging lens from the left.
Between the two lenses, the light appears to diverge from a point X distance f to the left of the first lens.
As the final image is at infinity:
f + 20cm = 30.6cm
f = 10.6cm.

I understand the closer you are to the subject and the greater the focal length, the lower the depth of field will be. However, how do these compare with each other?
i.e. if I want the minimum depth of field, for portraits etc, should I zoom out and go closer to the subject or stand further away and zoom in?

Stand further away. Zoom to about 85mm. Open up your lens (smaller numbers) and faster shutter speed. Set camera to aperture priority. Now having said all of that, I find it is fun to zoom out and move really close to children, especially boys with big ears.

I understand the closer you are to the subject and the greater the focal length, the lower the depth of field will be. However, how do these compare with each other?
i.e. if I want the maximum depth of field should I zoom out and go closer to the subject or stand further away and zoom in?

Stand further away and zoom in

For a larger depth of field you want a larger aperture which you can’t get if you’re too close.

I need some help with finding the focal length of a double convex lens. If possible could you tell me the formula for finding it. Many thanks…

You’ll need to know a few parameters for the lens. Specifically the radii of curvature of the two surfaces and their separation.

Use the formula found here http://en.wikipedia.org/wiki/Lens_(optics)#Lensmaker.27s_equation

If d is small compared to the radii of curvature then the last term in the equation can be ignored.

I am a photographer and just starting in Quick Time panoramas. Any ideas on the best lens (in terms of focal length) that will help achieve wonderful panoramas of hotels (both exterior and inside their rooms, suites, etc..)? I will be using a Nikon DSLR.

You can use any focal length you want, but there are a couple of considerations. A long lens will need to have more frames to get your 360 degree, on the other hand a wide angle a wide angle needs fewer frames but each frame is distorted by the lens. So a focal length of around 50mm (35mm format) is probably the best compromise.

Have fun and good luck, it’s a spectacular technique.

Chris

Suppose that you have 2 telescopes with the same aperture, Telescope A has a focal length 3 times longer than that of telelscope B. How would the image size differ in telescope A from that in telescope B?

The focal length of a telescope determines the magnification - all other things being equal…

Telescope A would have 3 times the magnification of B

Suppose that you have 2 telescopes with the same aperture, Telescope A has a focal length 3 times longer than that of telelscope B. How would the image size differ in telescope A from that in telescope B?

The focal length of a telescope determines the magnification - all other things being equal…

Telescope A would have 3 times the magnification of B