A person with nearsightedness wishes to switch from regular glasses to contact lenses. Should the contact lenses have a stronger or a weaker prescription than the glasses? Explain.
Answer to relevant QuestionsWith an object at the focal point of a magnifying glass, the magnification is given by m = (25 cm) / f (Eq. 25.4). According to this equation, the magnification could be increased indefinitely by using lenses with shorter ...A nearsighted man wears eyeglasses whose lenses have a focal length of –0.255. How far away is his far point? Using the small-angle approximation, compare the angular sizes of a car 1.5 m in height when viewed from distances of (a) 500 m and (b) 1050 m. What is the maximum magnification of a magnifying glass with a power of + 3.0 D for (a) A person with a near point of 25 cm and (b) A person with a near point of 10 cm? A – 150 x microscope has an eyepiece whose focal length is 4.4 cm. If the distance between the lenses is 20 cm, find the focal length of the objective.
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