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Two thin lenses made of the same glass with n=1.5 are used to make an achromatic...

Two thin lenses made of the same glass with n=1.5 are used to make an achromatic separated doublet. An overall power of 8D is desired using a separation of 16.67 cm. A)what two powers are required? B)what is the radius of this doublet’s Petzval surface?

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