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The dispersive powers of two materials are `0.30 & 0.28`. They are used to construct two lenses which are kept in contact to eliminate chromatic aberration (that means the `f_(v)=f_(r)` the focal ) If the material of disperive power 0.30 is 10cm, then the focal lenght (for av, color) of the lens of other material is :A. 28/3 cmB. `-0.20//3m`C. 0.75/7mD. None of these |
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Answer» Correct Answer - B `[(W_(1))/(f_(1))+(W_(2))/(f_(2))=0]` `W_(1)=0.3, f_(1)=10cm. W_(3)=0.28` `f_(2)=(-28)/(3)cm` |
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