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A first course in projective geometry . Fig. 916. It appears that an ellipse always has a real director circle;a hyperbola only when AC > BC. In the rectangular hyperbola AC =
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A convex glass lens ( mug = 1.5 ) has a focal length of 8 cm when placed in air. What is the focal length lens when it is immersed in water? ( muω = 43 )
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