Category Archives: focal

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 … Continue reading →

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 … Continue reading →

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 … Continue reading →

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: … Continue reading →

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, … Continue reading →

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 … Continue reading →

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 … Continue reading →

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 … Continue reading →

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 … Continue reading →

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 … Continue reading →

I am needing bifocals and have heard about bi-focal contacts, but have not tried it. I currently wear soft lenses. Thanks! no

The flashlight i have moves in and out of focus as i twist the cap. The light gradually gets more and then less condensed. Is there any way i can find the focal length of the lens in it? If … Continue reading →

sometimes I see a great photograph and try and determine the focal point. Could it be that the entire image is the focal point? I was just curious since it was something I read about composition that when taking pictures, … Continue reading →

I’m a 3D architectural artist and I’m suppose to match a rendering to image I got. Problem is, I got the very professional image from the camera of the iPhone to match too. So now I’m trying to figure this … Continue reading →