This preview shows page 1. Sign up to view the full content.
Mirrors and Lenses
295
23.54
(a) The thin lens equation gives the image distance for the first lens as
( )( )
11
1
40.0 cm
20.0 cm
40.0 cm
40.0 cm
20.0 cm
pf
q
==
=
+
−−
The magnification by this lens is then
1
1
1
40.0 cm
1.00
40.0 cm
q
M
p
=−
The real image formed by the first lens is the object for the second lens. Thus,
and the thin lens equation gives
21
50.0 cm
10.0 cm
pq
=
+
( )( )
22
2
10.0 cm
5.00 cm
10.0 cm
10.0 cm
5.00 cm
q
=
+
The final image is
10.0 cm in back of the second lens
(b) The magnification by the second lens is
2
2
2
10.0 cm
1.00
10.0 cm
q
M
p
, so the overall
magnification is
( )( )
12
1.00
MMM
−
1.00
1.00
−
This is the end of the preview. Sign up
to
access the rest of the document.
This document was uploaded on 10/20/2011.
 Spring '09
 Physics, Work

Click to edit the document details