Journal #85 4/28/11

Describe the image of an object at the center of curvature of a concave mirror. You should be able to tell me three things about this object.

DO NOT USE YOUR NOTES. EITHER USE YOUR MEMORY OR DRAW A PICTURE.

Ch. 17 Homework Check

•Take out your homework from pg. 469, pg. 472, and the worksheet.•Take out a blank sheet of paper and a pencil and number your page 1 to 10.

Homework Check pg. 469

1) In problem #13, give the image distance.

2) In problem #14, give the image distance.

3) In problem #15, give the height of the image.

4) In problem #16, give the object distance.

Homework Check pg. 472

5) In problem #18, give the height of the image.

6) In problem #20, give the focal length.

7) In problem #20, give the height of the image.

8

9

10

Trade Papers

• Trade papers with someone at a DIFFERENT table than yourself

• Right your name on the bottom of their paper• Only marked WRONG answers• Answers with no unit or the wrong unit are ½ wrong

Homework Check Answers

1. 28.8 cm 6. -30.0 cm2. 13.3 cm 7. 4.4 cm3. -1.9 cm 8. B4. 26.7 cm 9. Abe, Bev, Cis5. 1.1 cm 10. Abe, Han

Each answer is worth 10 points, put their grade out of 100 at the top of the page and return the page to them.

Pg. 469 (#13-16)

13. di = 28.8 cm14. di = 13.3 cm ; hi = -2.0 cm15. hi = -1.9 cm16. do = 26.7 cm ; ho = 5.0 cm

Pg. 472 (#17-21)

17. di = -8.57 cm18. di = -10.7 cm ; hi = 1.1 cm19. f = -96 cm20. di = -12.7 cm ; hi = 4.4 cm21. f = -0.60 m

Eva - HanDon - HanCis - HanBev - GuyAbe - Flo

Abe - EvaAbe - DonAbe - Cis

Abe - DonAbe - CisAbe , BevAbe , HanGuy , HanFlo - HanEva - HanDon - Han

Eva - HanDon - HanCis - HanBev - GuyAbe - Flo

Abe - EvaAbe - DonAbe - Cis

Abe - DonAbe - CisAbe , BevAbe , HanGuy , HanFlo - HanEva - HanDon - Han

A B C D E F G H

Eva Eva , Flo

Cis, Don, Flo, Eva

Abe, Bev, Cis, Don, EvaCis, Don, Eva

Bev, Cis

Everyone ElseEveryone ElseAbe, Bev

Abe, Bev, FloFlo

Abe, Don, Eva, Flo

No