Physics 222 Worksheet: Chapter 23, Optics

1) Which of the following has the highest frequency?

a) radio

b) red light

c) yellow light

d) blue light

2) The ratio of the speed of light in vacuum to the speed of light in a medium is the

a) index of refraction

b) angle of incidence

c) critical angle

d) focal length

3) The index of refraction of material A is less than that of material B.

a) The speed of light in B is greater than the speed in A and greater than the speed in vacuum.

b) The speed of light in B is greater than the speed in A but less than the speed in vacuum.

c) The speed of light in B is less than the speed in A but greater than the speed in vacuum.

d) The speed of light in B is less than the speed in A and less than the speed in vacuum.

4) The index of refraction of material A is less than that of material B.

a) A ray of light passing from A to B will be bent toward the normal.

b) A ray of light passing from A to B will be bent away from the normal.

c) A ray of light passing from A to B will be totally internally reflected.

d) A ray of light passing from A to B will be undeviated. 

5) When the angle of incidence exceeds the critical angle

a) the refracted ray will be bent toward the normal

b) total internal reflection will occur

c) there will be no reflected ray

d) the angle of refraction will equal the angle of incidence

6) A converging lens must

a) have two concave surfaces

b) have two convex surfaces

c) be thicker in the center than at the edges

d) be thinner in the center than at the edges

7) Fiber optics make use of

a) refraction

b) total internal reflection

c) focusing by curved surfaces

d) magnification

8) If the image distance is greater than the object distance then

a) the image is larger than the object

b) the image is smaller than the object

c) the image is erect

d) the image is virtual

9) Virtual, enlarged images can be produced by

a) converging lenses

b) diverging lenses

c) both of the above

d) neither of the above

 Ans: 1-d, 2-a, 3-d, 4-a, 5-b, 6-c, 7-b, 8-a, 9-a

Physics 222 Worksheet: Ray Diagrams

Use a ruler to draw the principle rays and locate the image in each diagram. From your results, determine if the image is real or virtual, inverted or erect, enlarged or reduced in size.

1) Converging Mirror

The image is (real, virtual) (inverted, erect) (enlarged, reduced)

2) Converging Lens

The image is (real, virtual) (inverted, erect) (enlarged, reduced)

3) Diverging Mirror

The image is (real, virtual) (inverted, erect) (enlarged, reduced)

4) Converging Lens

The image is (real, virtual) (inverted, erect) (enlarged, reduced)

5) Diverging Lens

The image is (real, virtual) (inverted, erect) (enlarged, reduced)

1) A converging lens or mirror can produce

a) real images only.

b) virtual images only.

c) either real or virtual images.

2) A diverging lens or mirror can produce

a) real images only.

b) virtual images only.

c) either real or virtual images.

3) If a converging lens produces a real image, it

a) must be larger than the object.

b) must be smaller than the object.

c) may be either larger or smaller than the object.

4) If a converging lens produces a virtual image, it

a) must be larger than the object.

b) must be smaller than the object.

c) may be either larger or smaller than the object.

Ans: 1-c, 2-b, 3-c, 4-a