The near point of a certain hyperopic eye is 100 cm in front of the eye. Find the focal length and power of the contact lens that will permit the wearer to see clearly an object that is 25 cm in front of the eye.
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The near point of a certain hyperopic eye is 100 cm in front of the eye.
Find the focal length and power of the contact lens that will permit the
wearer to see clearly an object that is 25 cm in front of the eye.
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- Suppose an astronomical telescope is being designed to have an angular magnification of 39.4. If the focal length of the objective lens being used is 96.5 cm, find the required focal length of the eyepiece and the distance between the two lenses for a relaxed eye. Hint: For a relaxed eye, the image formed by the objective lens is at the focal point of the eyepiece. (a) Find the required focal length of the eyepiece. (b) Find the distance between the two lenses for a relaxed eye.A lens system consists of a +4D lens and a +3D lens separated by 10 cm. Find the equivalent focal power and the positions of the principal points. An object 3 cm long is situated 50 cm in front of the first lens. What will be the position and size of the image produced by the combination?The focal length of the lens of a simple digital camera is 40 mm, and it is originallyfocused on a person 25 m away. In what direction must the lens be moved tochange the focus of the camera to a person 4.0 m away?
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