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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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![The least distance of distinct vision is 25cm. The focal length of a convex lens of a simple microscope is 5 cm. Its magnifying power if the image is at near point The least distance of distinct vision is 25cm. The focal length of a convex lens of a simple microscope is 5 cm. Its magnifying power if the image is at near point](https://d2rrqu68q7r435.cloudfront.net/images/2534507/d084c009-ce51-415b-807c-42394f6deae1.jpg)
The least distance of distinct vision is 25cm. The focal length of a convex lens of a simple microscope is 5 cm. Its magnifying power if the image is at near point
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![A card sheet divided into square each of size 1 mm^2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm ) A card sheet divided into square each of size 1 mm^2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm )](https://d2rrqu68q7r435.cloudfront.net/images/4263007/75dbdc40-999a-4144-a0f8-cb3873a76bac.jpg)
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The focal length of a convex lens is 10 cm. The magnifying powers when it is used as a magnifying glass to form the image at (i) near point and (ii) far
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