Name:    Unit 10E Chapater 13 Quiz

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.

A lens that causes incident parallel light rays to spread apart after refraction is called a
 a. converging lens b. diverging lens c. positive meniscus d. contact lens

2.

Which of the following statements is (are) true regarding converging and diverging lenses?
 a. A converging lens is thinnest in the middle. b. A diverging lens is thickest in the middle. c. A converging lens causes incident parallel light rays to come together through a single point after refraction. d. all of the above

3.

There are always how many refractions in a lens?
 a. one b. two c. three d. four

4.

The point on the principal axis of a lens where light rays parallel to the principal axis converge after refraction is called the
 a. optical centre b. principal focus c. positive meniscus d. negative meniscus

5.

An emergent ray can be defined as
 a. the light ray that enters a lens before refraction b. the light ray that leaves a lens before refraction c. the light ray that enters a lens after refraction d. the light ray that leaves a lens after refraction

6.

Which of the following rules is true for thin, converging lenses?
 a. A ray through the secondary principal focus is refracted through the principal focus. b. A ray parallel to the principal axis is refracted through the secondary principal focus. c. A ray through the optical centre is refracted parallel to the principal axis. d. A ray through the optical centre continues straight through without being refracted.

7.

What type of image is formed by a converging lens, if an object is placed at exactly 2F´?
 a. smaller, inverted, real b. same size, inverted, real c. larger, inverted, real d. same size, inverted, virtual

8.

What type of image is formed by a converging lens, if an object is between F´ and the lens?
 a. larger, upright, virtual b. larger, upright, real c. smaller, upright, virtual d. smaller, upright, real

9.

A diverging lens always produces an object that is
 a. smaller, upright, and virtual b. smaller, inverted, and virtual c. larger, upright, and virtual d. larger, inverted, and real

10.

A converging lens has a focal length of 10 cm. An object is located 30 cm from the lens. What will be the approximate distance from the image to the optical centre?
 a. 11 cm b. 15 cm c. 22 cm d. 28 cm

11.

Which of the following devices uses a converging lens to produce a smaller, inverted, real image?
 a. camera b. movie projector c. magnifying glass d. compound microscope

12.

Which of the following devices requires the use of two converging lenses?
 a. camera b. refracting telescope c. movie projector d. magnifying glass

13.

Which of the following devices uses a converging lens to produce a real image?
 a. refracting telescope b. movie projector c. magnifying glass d. compound microscope

14.

What is the name of the coloured part of the eye, which opens and closes around a central hole to let in more or less light?
 a. iris b. pupil c. cornea d. retina

15.

The cornea-lens combination in the human eye acts as a converging lens and produces what type of image on the retina?
 a. smaller, virtual, and inverted b. larger, real, and upright c. smaller, real, and upright d. smaller, real, and inverted

16.

The changing of shape of the eye lens by eye muscles to allow a sharply focused image to form on the retina is called
 a. hyperopia b. accommodation c. presbyopia d. myopia

17.

Another name for near-sightedness is
 a. hyperopia b. positive meniscus c. presbyopia d. myopia

18.

Lenses that are placed directly on the cornea of the eye and serve the same purpose as glasses are called
 a. converging lenses b. diverging lenses c. contact lenses d. negative meniscus

19.

When a person is far-sighted, near vision is corrected with a
 a. converging lens b. diverging lens c. negative meniscus d. none of the above

20.

An object with a height of 6.0 cm is placed in front of a converging lens. An inverted, real image of height 24 cm is noticed on the other side of the lens. What is the magnification of the lens?
 a. -4 b. -0.25 c. 0.25 d. 4