Biomedical Engineering Reference
In-Depth Information
The light rays that form this real image exist in air.
n
′
′
=
L
′
l
(1.00)(100)
l
=
+
28.13 D
′
′
=
+
3.55 cm
The image is located 3.55 cm to the right of the second lens surface.
(b) Total lateral magnification
l
=
(
M
L
for first surface)(
M
L
for second surface)
−
4.00 D
+
7.33 D
⎛
⎝
⎞
⎠
⎛
⎝
⎞
⎠
Total lateral magnification
=
+
6.40 D
+
28.13 D
Total lateral magnification
=
−
0.17
×
(30.00 mm)(
5.10 mm
(c) Since the final image is formed by converging light rays, it is real.
(d) The final real image is inverted. This is indicated by the negative sign that
is given for the total magnification.
(e) Biconvex
−
0.17
×)
=
−
2. (a)
Power of first surface
:
(
n
−
n
)
′
F
1
=
r
(1.52
−
1.00)
F
1
=
+
0.12 m
F
1
=
+
4.33 D
Power of second surface
:
(
n
−
n
)
′
F
2
=
r
(1.00
−
1.52)
F
2
=
−
0.07 m
F
2
=
+
7.43 D
Refraction at first surface
:
L
′
=
L
+
F
(1.00)(100)
−
⎡
⎥
⎤
⎥
′
=
L
+
4.33 D
3.00 cm
′
=
−
L
33.33 D
+
4.33 D
L
′
=
−
29.00 D
