Entry Test MCQ :: Optical Instruments

@ : Home > Physics > Optical Instruments

A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is

[A].	f2 + f1	[B].	f2 - f1
[C].	f1f2/f2+f1	[D].	f1f2/f1-f2

Answer: Option D