Two lenses have focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ and their dispersive powers are ${{\omega }_{1}}$ and ${{\omega }_{2}}$ respectively. They will together form an achromatic combination if

Question

Accepted Answer

${{\omega }_{1}}{{f}_{2}}+{{\omega }_{2}}{{f}_{1}}=0$

Answer

${{\omega }_{1}}{{f}_{1}}={{\omega }_{2}}{{f}_{2}}$

Answer

${{\omega }_{1}}+{{f}_{1}}={{\omega }_{2}}+{{f}_{2}}$

Answer

${{\omega }_{1}}-{{f}_{1}}={{\omega }_{2}}-{{f}_{2}}$

Ray Optics and Optical Instruments

Question: Two lenses have focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ and their dispersive powers are ${{\omega }_{1}}$ and ${{\omega }_{2}}$ respectively. They will together form an achromatic combination if

Ray Optics and Optical Instruments

Question: Two lenses have focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ and their dispersive powers are ${{\omega }_{1}}$ and ${{\omega }_{2}}$ respectively. They will together form an achromatic combination if

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