 |
1 | |
A lens that is thinner in the middle than it is at the edges will be a converging lens. |
|
| | A) | True |
| | B) | False |
|
2 | |
A plano-concave lens has a virtual focus. |
|
| | A) | True |
| | B) | False |
|
3 | |
Both surfaces of a converging meniscus lens should be reckoned as positive, according to convention. |
|
| | A) | True |
| | B) | False |
|
4 | |
Virtual images are formed on the same side of the lens as the object. |
|
| | A) | True |
| | B) | False |
|
5 | |
The overall magnification of a compound optical instrument is equal to the product of the magnifications of the component lenses. |
|
| | A) | True |
| | B) | False |
|
6 | |
Chromatic aberration is a lens defect in which the extreme rays are brought to a focus nearer the lens than those rays entering near the optical center of the lens. |
|
| | A) | True |
| | B) | False |
|
7 | |
According to convention, the object distance is reckoned as negative when it is measured to a virtual object. |
|
| | A) | True |
| | B) | False |
|
8 | |
All images formed by diverging lenses are virtual, diminished, and erect. |
|
| | A) | True |
| | B) | False |
|
9 | |
In a simple microscope, the greatest magnification occurs as the object gets closer and closer to the lens surface. |
|
| | A) | True |
| | B) | False |
|
10 | |
Whenever the object is beyond the focal point of a converging lens, the magnification will always be negative. |
|
| | A) | True |
| | B) | False |
|
11 | |
Images formed from real objects by diverging lenses are always |
|
| | A) | virtual |
| | B) | enlarged |
| | C) | inverted |
| | D) | real |
|
12 | |
A diverging lens may not have |
|
| | A) | a negative focal length |
| | B) | a positive focal length |
| | C) | one plane surface |
| | D) | one convex surface |
|
13 | |
For a compound microscope, the image formed by the eyepiece is |
|
| | A) | real |
| | B) | inverted |
| | C) | erect |
| | D) | diminished |
|
14 | |
A negative magnification always means that the image is |
|
| | A) | erect |
| | B) | real |
| | C) | virtual |
| | D) | inverted |
|
15 | |
Which of the following is not characteristic of images formed by real objects located inside the focal point of a converging lens? |
|
| | A) | Virtual |
| | B) | Erect |
| | C) | Real |
| | D) | Enlarged |
|
16 | |
A meniscus lens has a convex surface of curvature 20 cm and a concave surface of curvature -30 cm. If the lens is constructed from glass (n = 1.5), the focal length will be |
|
| | A) | -4 cm |
| | B) | +4 cm |
| | C) | -120 cm |
| | D) | +120 cm |
|
17 | |
An object is located 10 in. from a thin converging lens whose focal length is 30 in. The image distance is approximately |
|
| | A) | -7.5 in. |
| | B) | +7.5 in. |
| | C) | 15 in. |
| | D) | -15 in. |
|
18 | |
A diverging meniscus lens has a focal length of -20 cm. If the lens is held 10 cm from the object, the magnification is |
|
| | A) | -0.667 |
| | B) | +0.667 |
| | C) | -2 |
| | D) | +2 |
|
19 | |
A plano-convex lens is ground from glass (n = 1.5). If the focal length is to be 20 cm, the radius of the curved surface should be |
|
| | A) | 10 cm |
| | B) | 20 cm |
| | C) | 30 cm |
| | D) | 40 cm |
|
20 | |
A 6-ft-high image is projected on a screen located 40 ft from a converging lens. If the object size is 0.2 ft, the focal length must be |
|
| | A) | 0.736 ft |
| | B) | 1.29 ft |
| | C) | 1.38 ft |
| | D) | 2.79 ft |
|
21 | |
Images formed by diverging lenses are always , , and in size. |
|
|
|
22 | |
The of a lens is the distance from the optical center of the lens to either focus. |
|
|
|
23 | |
An object at a distance beyond twice the focal length of a convex lens forms an image that is , , and in size. |
|
|
|
24 | |
The object distance and the image distance are considered for real images and objects and for virtual images and objects. |
|
|
|
25 | |
A positive magnification means that the image is , and a negative magnification means the image is . |
|
|
|
26 | |
Three examples of converging lens are , , and . |
|
|
|
27 | |
A converging lens is in the middle than at the edges, whereas a diverging lens is in the middle. |
|
|
|
28 | |
A ray parallel to the axis passes through the of a converging lens or appears to come from the of a diverging lens. |
|
|
|
29 | |
A(n) image is formed on the same side of the lens as the object; a(n) image is formed on the opposite side. |
|
|
|
30 | |
A ray that passes through the of a lens will not be deviated. |
|
|