(1) The focal length of the camera in your cell phone is around 4.15 mm What is

Question

(1) The focal length of the camera in your cell phone is around 4.15 mm What is the radius of curvature of the lens in this camera? The distance between the lens and the detector in your phone is basically fixed - also around 4 mm. how mathematically that objects that are relatively far away can easily be imag ith such a camera, but that objects that are relatively close cannot easily be imaged (in f edistance at which the ability to focus diminishes? Does this correspond with your experience of ng your phone camera? Feel free to draw any pictures that might help you explain your answer. ed (that is, in focus) ocus). What is

Explanation / Answer

the basic lens which will be used in mobile should have a wide angle,and the lens will be convex lens.

relation between focal length and the radius of curvature of convex lens will be f = 1/2R where R is the radius of curvature. therefore R = 1/2f since given f = 4.15mm ,

R = 1/ 2 x 4.15 x 10-3 = 1 / 9 x 10-3 = 1000 / 9 = 0.11 mm

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