Suppose we focus a simple single-lens (focal length f, diameter D) camera at infinity. We then point the camera at a point object at distance s (not at infinity). What is the diameter of the out-of-focus disk on the sensor?
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Suppose we focus a simple single-lens (focal length f, diameter D) camera at infinity. We then point the camera at a point object at distance s (not at infinity). What is the diameter of the out-of-focus disk on the sensor?
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- An older camera has a lens with a focal length of 50 mm and uses 32-mm-wide film to record its images. Using this camera, a photographer takes a picture of the Golden Gate Bridge that completely spans the width of the film. Now he wants to take a picture of the bridge using his digital camera with its 14-mm-wide CCD detector. What focal length should this camera's lens have for the image of the bridge to cover the entire detector?A camera lens has a focal length of 35.0 mm. its f-stop setting range from f-1.4 to f-22. What is the maximum diameter of the aperture?The angular magnification of an astronomical telescope in normal adjustment is 36, and the diameter of the objective lens is 72mm. (Notice that this is the same configuration as a beam expander, see figure below which is NOT to scale. a. What is the minimum diameter of the eyepiece required to collect all the light entering the objective lens from a distant point source on the axis of the instrument? b. In order to use the thin lens approximation, the radius of curvature of the lens should be larger than the diameter of the lens itself. For a radius of curvature of 720mm for both sides of the objective lens (one is negative, one is positive), and an index of refraction of the objective glass of 1.5, what is the focal length of the Objective Lens?c. What is the focal length of the eyepiece given the focal length of the objective lens? d. What is the minimum length of the telescope? (i.e. the total distance between the eyepiece and the objective lenses).
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