Optics Quiz

An object is located 0.20 meters from a converging lens which has a focal length of 0.15 meters. Relative to the object, the image formed by the lens will be:

• virtual, inverted, smaller

• real, inverted, smaller

• real, inverted, larger

• virtual, upright, larger

A beam of light passes from medium 1 to medium 2 to medium 3 as shown in the accompanying figure. What is true about the respective indices of refraction (n₁, n₂, and n₃)?

• n₁ > n₂ > n₃

• n₁ > n₃ > n₂

• n₂ > n₃ > n₁

• n₂ > n₁ > n₃

A laser is embedded in a material of index of refraction n. The laser beam emerges from the material and hits a target. See the accompanying figure for the position parameters of the laser and target. The value of n is:

• 1.4

• 1.5

• 2.1

• 3.5

A beam of light is directed toward point P on a boundary as shown to the right. Which segment best represents the refracted ray?

• PA

• PB

• PC

• PD

• PE

Which of the following are possible for the images formed by the lens in the accompanying figure? Select two answers.

• Real and inverted

• Real and smaller in size

• Real and upright

• Virtual and smaller in size

An image is formed on a screen by a convergent lens. If the top half of the lens is then covered what will happen to the image?

• the image is dimmer but otherwise unchanged

• the image becomes half as big

• only the top half of the image is produced

• only the bottom half of the image is produced

The index of refraction of this lens is equal to the index of refraction of the surrounding. After striking the lens shown in the diagram at right, the light ray will most likely follow which path?

• A

• B

• C

• D

• E

An object is placed near a plane mirror, as shown above. Which of the labeled points is the position of the image?

• B

• C

• D

• E

When you use a magnifying glass, you hold the object which you are observing closer than one focal length to the lens, which is a convex lens. The image:

• is minified and virtual

• is magnified and virtual

• is minified and real

• is magnified and real

A physics student places an object 6.0 cm from a converging lens of focal length 9.0 cm. What is the magnitude of the magnification of the image produced?

• 0.6

• 1.5

• 2.0

• 3.0