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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 May 2007 17:43:06 IST
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If d>fcon then parallel rays converge due to the lens at a point before they reach the mirror. In this case the focal length of the system is fcon .
If d<fcon
For parallel rays striking the lens they converge at focus. Hence for the mirror,
u = -(fcon - d) (A virtual object)
Applying the mirror formula,
1/v + 1/(fcon - d) = -1/fdiv
v = - [(fcon - d) fdiv ] /(fcon + fdiv -d)
Distance from the optic centre of the lens
[(fcon - d) fdiv ] /(fcon + fdiv -d) + d
= (fcon fdiv - (fcon + d)d)/(fcon + fdiv -d)
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