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How is the glass strength of magnifying glasses (telescope) in dioptres calculated?

April 26, 2017calculated dioptres glass glasses magnifying strength telescope

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How is the glass strength of magnifying glasses (telescope) in dioptres calculated?

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The magnification required is multiplied by 4. To obtain 4 times magnification , a magnifying glass of +16 dpt must be used. The reading distance would be 6.3 cm.