A achromatic combination is made with a lens of focal length \[f\] and – McqOptions

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1.	A achromatic combination is made with a lens of focal length \[f\] and dispersive power \[\omega \] with a lens having dispersive power of \[2\omega \]. The focal length of second will be [RPET 1997]
A.	2 f
B.	\[f/2\]
C.	\[-f/2\]
D.	? 2 f
Answer» E.

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