An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively.

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An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively.
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Nov
An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively. An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their [...]
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