What links a click/tap position to select an object on screen?

The image of object formed by a lens on screen is not sharp focus suggest method to get clear focusing of image on the screen without disturbing the position of the object the lens or the screen?

  • Answer:

    You could insert a second lens in the focal path, between the object and the first lens. The second lens can be designed (or moved) to focus the image on the screen. This is the same function that eyeglasses do for people with poor vision. The second lens, the eyeglasses, are inserted between the viewed object and the lens of the eyes. The second lens is designed to correct the distortion of the eye lens, thus creating an in-focus object on the "screens" of the eyes.

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