Physics 72: Chapter 34 Problem Set Summer 2010

Name: Score:

Lecturer: Mr Carlos Baldo III Section: X7-7

Encircle the letter of the correct answer. Solve each problem clearly and completely for full credit.

For the next two numbers, consider a fitness gym buff standing in between two parallel plane mirrors. He then

looks at the image of his flexed biceps on one of the mirror.

1. Vanity 101. How many images of his biceps would he see on the mirror?

A. None B. One

C. Two

D. Four

E. Infinite

2. Wow. Compare the orientation of the resulting image/s relative to the object.

A. Nothing to compare B. Vertical and horizontal axes orientations are the same

C. Back and front appearances are reversed.

D. Vertical and horizontal axes orientations are the same; back and front appearances are reversed.

E. Vertical and horizontal axes orientations are not the same; back and front appearances are reversed.

3. Ate Guy. Nora stands 10-cm in front of a plane mirror and looks at the image of her 0.25-cm2 mole. She is then shocked to see that the image of her mole ________________________.

A. Shrinks in size

B. Increases in size

C. Is of the same size as her’s D. Splits into two

E. Vanishes

For the next two numbers, consider Nemo is swimming at a depth D below the surface of a pond (nwater=1.33).

4. Nemo nag-eemo. What is the apparent depth of Nemo as viewed from directly overhead (nair=1)?

A. 1.33D B. 0.33D

C. D/1.33

D. D/0.33 E. D

5. Emo Nemo. What is the magnification of the apparent image of Nemo relative to the object?

A. 0.5

B. 1.0

C. 2.0

D. (1.0) D

E. (2.0) D

For the next two numbers, consider an ant placed 36-cm in front of a concave mirror with R = 36-cm.

6. Ganun pa rin. If the mirror is immersed in water (refractive index 4/3), what is its radius of curvature?

A. 27.0 cm

B. 36.0 cm

C. 48.0 cm

D. 54.0 cm

E. 72.0 cm

7. Doon din. Where would the image form?

A. At the center of curvature B. In between the center of curvature and the focal point

C. At the focal point

D. In between the focal point and the vertex

E. At the back side of the mirror

Physics 72: Chapter 34 Problem Set Summer 2010

8. Kasingsukat. An ant is 10 cm from a concave mirror whose radius of curvature is 10 cm. The image is

_______. A. real, inverted, magnified

B. real, inverted, reduced C. real, inverted, the same size

D. virtual, upright, magnified

E. virtual, upright, reduced

9. Car side mirror. Usually printed on a car’s side view mirrors is this warning: “Objects in the mirror are closer than they appear.” The objects are also smaller than they would appear if the driver simply turned

and looked at them directly. What type of mirror is used? Describe the image seen on the mirror. A. Convex: virtual, reduced and upright

B. Convex: real, reduced and upright

C. Concave: virtual, reduced and upright

D. Concave: real, reduced and upright

10. Tooth fairy. A lady guard pretending to be a dentist wants a small mirror that will produce an upright

image with lateral magnification of 4 when the mirror is located 1 cm from the tooth. What should be the radius of curvature of the mirror?

A. 3/8 cm

B. 5/8 cm

C. 1 cm

D. 8/5 cm E. 8/3 cm

11. Refracting surface. A beam of parallel light rays from a laser is incident on a solid transparent sphere

with index of refraction n. If a point image is produced at the back of the sphere, what is the index of

refraction of the sphere?

A. 1.0

B. 1.5 C. 2.0

D. 2.5 E. 3.0

12. Oink. Consider a marked acetate placed in front of a spherical concave mirror with focal length f, vertex

V and center of curvature C as shown. The image of the acetate formed as seen by the observer appears

For the next two numbers, consider an arrow object at point O placed in front of a converging lens wherein the object distance is less than the focal length of the lens.

13. E to na. The image is formed on the ____________ and the

image is _________________ the lens than the object.

A. Transmission side; closer to B. Transmission side; farther from

C. Transmission side; of the same distance

D. Incidence side; closer to

E. Incidence side; farther from

14. E-C to dapat. The image formed appears _________________.

A. Inverted, magnified, real B. Inverted, reduced, real

C. Upright, magnified, real

D. Upright, reduced, virtual

E. Upright, magnified, virtual

sphere

Physics 72: Chapter 34 Problem Set Summer 2010

For the next two numbers, consider an arrow object at point O placed in front of a concave lens wherein the

object distance is less than the focal length of the lens.

15. To C is to believe. The image is formed on the ____________ and the image is _________________ the lens than the object.

A. Incidence side; of the same distance

B. Incidence side; farther from

C. Incidence side; closer to

D. Transmission side; farther from E. Transmission side; closer to

16. Aywan ko. The image formed appears _________________.

A. Upright, magnified, virtual

B. Upright, reduced, virtual

C. Upright, magnified, real

D. Inverted, reduced, real E. Inverted, magnified, real

17. Converging lens. Consider acetate printed with Calvin’s face, placed in front of a converging lens with

focal length f as shown below. Calvin’s face as seen without the lens is shown in boxed picture. The

image of the acetate formed as seen by the observer (Susie) appears ______.

For the next three numbers, consider an arrow object placed 7.5-cm in front of a diverging lens (f1 = -15-cm)

and a converging lens (f2 = 7.5-cm). The distance between the two lenses is 30-cm.

18. Virtual kasi. The distance of the first image from the diverging lens ____ thus the image is _________.

A. -15-cm; virtual

B. -7.5-cm; virtual

C. -5-cm; virtual D. 5-cm; real

E. 7.5-cm; real

19. Second object. The first image will now be the object

to the second lens. The image formed by this object to

the second lens will now be final image of the lens

system. The final image is ______ and _______ relative to the original object.

A. Inverted; reduced B. Inverted, magnified

C. Inverted; of the same size

D. Upright; reduced

E. Upright; magnified

20. Series of lenses. Chicken Little 8.0 cm high is placed 12.0 cm to the left of a converging lens of focal

length 8.0 cm. A second converging lens of focal length 6.0 cm is placed 36.0 cm to the right of the first lens. Describe Chicken Little’s image.

A. real, inverted, reduced B. real, upright, magnified

C. real, upright, the same size D. virtual, upright, magnified

E. virtual, upright, reduced

Physics 72: Chapter 34 Problem Set Summer 2010

21. Focal length. When an object is placed 8 cm to the left of a lens, a virtual image is formed 4.0 cm from the

lens on the same side as the object. What is the focal length of the lens? A. -4.0 cm

B. -8.0 cm C. 2.0 cm

D. 4.0 cm

E. 8.0 cm

22. Mir-roars! A very far object is incident to a larger concave mirror with radius of curvature R =20-cm. The rays are then reflected towards an

unknown smaller mirror that later forms a final image located at the vertex (V) of the larger concave mirror. The distance between mirrors is 5-cm.

Describe the smaller mirror.

A. Concave mirror (curve part facing the left) with R = 10-cm

B. Concave mirror (curve part facing the left) with R = 5-cm

C. Concave mirror (curve part facing the left) with R = 10-cm D. Concave mirror (curve part facing the left) with R = 5-cm

E. Plane mirror with R approaching infinity

For the next two questions, consider a thin converging lens with second focal point, f, which is at a distance R

from the vertex of a convex mirror with radius of curvature, -R. An extended object from infinite distance is

incident on to the left of the converging thin lens.

23. Lens system. Where will the final image be formed?

A. 3R B. R/3

C. –3R

D. –R/3

E. No image will be formed

24. Image formation. What is the complete description of the final image formed after the concave mirror with

respect to the extended object at infinity? A. Reduced, real, upright

B. Magnified, real, upright C. Reduced, virtual, upright

D. Reduced, virtual, inverted

E. Magnified, virtual, inverted

For the next two numbers, consider a double convex thin glass lens (with index of refraction n=5/4) has radii of curvature of magnitude 10 cm and 15 cm as shown. The thin glass is immersed in air.

25. Focal length. Find its focal length.

A. 12 cm

B. 24 cm C. 48 cm

D. 54 cm E. 60 cm

26. Focal length. The focal length will increase ________.

A. if, instead of air, the lens will be immersed in medium with higher index of refraction. B. if, instead of air, the lens will be immersed in medium with lower index of refraction.

C. if the index of refraction of glass is decreased.

D. A & C

E. B & C

The SAND Prince