Biomedical Engineering Reference
In-Depth Information
The rays that form this virtual image exist in air.
n
′
′
=
L
′
l
(1.00)(100)
l
=
−
2.48 D
′
′
=
−
l
40.32 cm
The image is located 40.32 cm to the left of the second lens surface.
(b) Total lateral magnification
=
(
M
L
for first surface)(
M
L
for second surface)
−
2.50 D
+
0.99 D
⎛
⎝
⎞
⎠
⎛
⎝
⎞
⎠
Total lateral magnification
=
+
0.97 D
−
2.48 D
Total lateral magnification
=
+
1.03
×
(30.00 mm)(
30.90 mm
(c) Since the final image is formed by diverging light rays, it is virtual.
(d) The final virtual image is erect as indicated by the positive sign of the
magnification.
(e) Meniscus
+
1.03
×
)
=
+
4. (a)
Refraction at first lens
:
L
′
=
L
+
F
(1.00)(100)
−
⎡
⎥
⎤
⎥
′
=
L
+
(
−
10.00 D)
30.00 cm
′
=
−
L
3.33 D
+
(
−
10.00 D)
L
′
=
−
13.33 D
n
′
′
=
L
′
l
(1.00)(100)
l
=
−
13.33 D
′
′
=
−
l
7.50 cm
This virtual image is located 7.50 cm to the left of the first lens and 10.00 cm
(i.e., 7.50
10.00 cm) to the left of the second lens. Keep in mind
that the rays that form this image exist in
air.
It serves as an object for the
second lens.
+
2.50 cm
=
