then find the focal length of contact lens

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If focal length of human eye is 2cm, then find the focal length of contact lens, such that a combined focus system of focal length 2.5cm is obtained after using contact lens.
13
Nov
If focal length of human eye is 2cm, then find the focal length of contact lens, such that a combined focus system of focal length 2.5cm is obtained after using contact lens. If focal length of human eye is 2cm such that a combined focus system of focal length 2.5cm is obtained after using contact [...]
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