# Homework Help: Need help with later magnification and location

1. Apr 24, 2012

### dkgrubby

Need help with later magnification and location!!

Two lenses, with = +20.0 and = +30.0 , are placed on the axis, as shown in the figure. An object is fixed 50.0 to the left of lens 1, and lens 2 is a variable distance to the right of lens 1.

Part A
Find the lateral location of the final image relative to lens 2 for the case = 100 .
=54.5
Correct

Part B
Find the lateral magnification of the final image relative to lens 2 for the case = 100 .
=

One attempt remaining; Try Again

Part C
Find the lateral location of the final image relative to lens 2 for the case = 30.0 .
=3.00
Correct

Part D
Find the lateral magnification of the final image relative to lens 2 for the case = 30.0 .
=

Try Again; 4 attempts remaining

Part E
Find the lateral location of the final image relative to lens 2 for the case = 0.
=

Try Again; 5 attempts remaining

Part F
Find the lateral magnification of the final image relative to lens 2 for the case = 0.
=

Part G
Show that your result for part E agrees with the relation for the effective focal length of two lenses in contact, .
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