Biomedical Engineering Reference
In-Depth Information
Alternatively, we could use vergence to calculate the magnification as
follows:
L
L
′
M
=
=
−
20.00 D
M
−
13.33 D
M
= +
1.50
×
(
+
1.50)(
+
2.00 cm)
=
+
3.00 cm
The image is erect.
′
=
2. (a)
L
L
+
F
(100)(1.00)
−
⎡
⎥
⎤
⎥
L
′
=
+
6.67 D
20.00 cm
′
=
+
L
1.67 D
−
1
′
L
=
′
l
=
−
(100)(1.00)
l
′
+
1.67 D
′
=
−
l
59.88 cm
(b) Since the image vergence is positive, the image is formed by converging
light rays and is real.
′
−
l
(c)
M
=
l
=
−(−
59.88 cm)
M
−
20.00 cm
M
= −
3.00
×
(
−
3.00)(
+
2.00 cm)
=
−
6.00 cm
The image is inverted.
−
1
=
3. (a)
F
′
f
−
1
=
F
+
0.15 m
= −
F
6.67 D
′
=
L
L
F
(100)(1.00)
−
+
⎡
⎥
⎤
⎥
′
=
L
+ (−
6.67 D)
25.00 cm
′
=
−
L
10.67 D
