A) How is a good camera (one that can be "focused") able to take clear pictures of objects that are a variety of distances from the camera? B) How is the eye able to place clear images on the retina of objects that are a variety of distances from the eye? C) For a fixed focus camera to take clear pictures, the object distance must satisfy a certain inequality. What is this inequality? D) Why does the near point increase as people age?

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