Biomedical Engineering Reference
In-Depth Information
When an object is located 4.35 cm to the left of this plus lens, a real image is
focused 50.00 cm to the right of the lens.
′
=
6.
L
L
+
F
(100)(1.00)
−
=
L
+
(
+
25.00 D)
50.00 cm
L
= −
27.00 D
n
l
L
=
(100)(1.00)
l
−
27.00 D
=
l
= −
3.70 cm
When an object is located 3.70 cm to the left of this plus lens, a virtual image
is formed 50.00 cm to the left of the lens. Since the object is located within the
focal length of this thin plus lens, the image is virtual and magnified.
′
=
7.
L
L
+
F
(100)(1.00)
−
=
L
+
(
−
5.00 D)
10.00 cm
L
= −
5.00 D
n
l
L
=
(100)(1.00)
l
−
5.00 D
=
l
= −
20.00 cm
When an object is located 20.00 cm to the left of this negative lens, a virtual
image is formed 10.00 cm to the left of the lens.
8. (
x
)(
x
′
)
=
f
2
(0.25 m)(0.40 m)
=
f
2
f
=
0.32 m
n
f
F
=
′
1.00
F
=
+
0.32 m
F
=
+
3.13 D
