Physics-Light

Hey everyone, I am re-taking this exam, but have lost my book and can't get my PDF form of it to work. So I am hoping you can help me with the correct answers.
Thank you!
-Susan



2. Which of the following values represents an index of refraction of an actual material?
A. 0
B. 1 / 4<my answer>
C. 1 / 2
D. 5 / 4


4. If a 72-candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is
A. 8 lux.
B. 24 lux.
C. 216 lux.<my answer>
D. 648 lux.



8. The unit for measuring the rate at which light energy is radiated from a source is the
A. Angstrom.<my answer>
B. lux.
C. lumen.
D. candela.

9. Compared to yellow light, orange light has
A. the same frequency.
B. a faster wave velocity.
C. a longer wavelength.
D. a different polarization.<my answer>




13. A virtual image produced by a lens is always
A. larger than the object.
B. smaller than the object.
C. located in front of the lens.
D. located in the back of the lens.<my answer>

14. In which of the following materials is the velocity of light greatest?
A. Air
B. Water
C. Crown glass
D. Fused quartz<my answer>



16. When a simple magnifying glass is used properly, the image will be formed
A. just inside the focal length of the lens.<my answer>
B. about 250 millimeters in front of the lens.
C. at the focal point of the lens.
D. about 500 millimeters behind the lens.

17. When the image of a distant object is brought into focus in front of a person's retina, the defect is called
A. nearsightedness.
B. farsightedness.<my answer>
C. chromatic aberration.
D. spherical aberration.

18. Reflecting telescopes are popular because they're
A. more powerful than a refracting telescope.<my answer>
B. smaller than a refracting telescope.
C. easier to build than a refracting telescope.
D. more durable than a refracting telescope.



20. Which of the following occurs when light is reflected from a rough or unpolished surface?
A. The original pattern of the light is distorted.
B. The original pattern of the light is preserved.<my answer>
C. The angle of reflection is less than the angle of incidence.
D. The angle of reflection is greater than the angle of incidence.

21. An object is located 51 millimeters from a diverging lens. The object has a height of 13 millimeters and the image height is 3.5 millimeters. How far in front of the lens is the image located?
A. 1.12 millimeters
B. 13.7 millimeters
C. 51 millimeters<my answer>
D. 189 millimeters



23. When a beam of light passes at an oblique angle into a material of lower optical density, the angle of incidence is
A. less than the angle of reflection.<my answer>
B. less than the angle of refraction.
C. greater than the angle of reflection.
D. greater than the angle of refraction.


25. If an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 millimeters in front of the lens, what is the height of the image?
A. 6 millimeters
B. 8 millimeters
C. 14 millimeters
D. 22 millimeters<my answer>

  1. 👍
  2. 👎
  3. 👁
  1. You should have done better picking answers at random. All of your 13 choices are wrong. Did you get the other 12 right?

    You need to spend some time reviewing the subject, otherwise you do not deserve to pass the assignment. Try answering them again and explain the reasons behind your answers, and I will be glad to critique your reasoning.

    1. 👍
    2. 👎
  2. if an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 millimeters in front of the lens, what is the height of the image?

    1. 👍
    2. 👎
  3. DcdOn2 hello everybody!

    1. 👍
    2. 👎
  4. 81c798ecb5

    1. 👍
    2. 👎
  5. 26c0f2c32e

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Art and world cultures

    I’m taking the grade 9 unit 7 lesson one art and world cultures final exam right now. I’ll post the answers when I’m done so hopefully it helps someone!!

  2. Connexus Algebra 2B Semester Exam. Please Help

    I am taking my Algebra Semester exam, and I would really like the answers to the test- There are 50 questions. The first question is What is a simpler form of the radical expression? 4 Sqrt 2401x^12y^16

  3. LNU math

    math In a class of 50 students it was found 21 are taking English 14 are taking Math 28 are taking History 7 are taking Math and English 10 are taking Math and History 11 are taking History and English 3 are taking all three

  4. *****Help Statistic

    Imagine taking a 10-question true or false exam. You randomly guess at each question. Don't do any calculations, just tell me your first impressions a). Is this a binomial setting? b) How many question do you think you would get

  1. Math

    100 students were asked whether they are taking psychology or biology. 61 were taking pyschology, 18 were taking both and 12 were taking neither. how many were taking biology?

  2. Algebra

    Hey can anyone help me with the Algrbra 1A semester exam lesson 2 unit 4 thank you

  3. Arithmetic

    A box in a college bookstore contains books, and each book in the box is a history book, an English book or a science book. If one-third of these books are history books and one-sixth are English books, what fraction of the books

  4. Maths

    Alexis reads 2/5 of her book on Monday then 1/2 of the remaining pages on Tuesday then 5/9 of the remaining pages on Wednesday the nthe remaining pages on Thursday plus reads 68 more pages on Tuesday then Wednednesday how many

  1. visual basic programming

    Write a Visual Basic program that will calculate the assessment marks of a student taking the Computer Programming subject in College. The program must be able to determine the total result and finally display the grade of that

  2. math

    need to make a venn diagram using 3 circles. A survey on subject being taken by 250 students at a certain college revealed the following info: 1. 90 were taking math 2. 145 were taking history 3. 88 were taking english 4. 25 were

  3. Chemistry

    Our professor just told us that the final exam will be the ACS exam, we are taking general Chemistry II. What is the best way to study for ir? Is the preparing for ACS general chemistry study guide good? If we are taking general

  4. english

    this is for the book to kill a mockingbird what is significant about Mr. Cunningham kneeling down and saying to Scout "i'll tell him you said hey, little lady"

You can view more similar questions or ask a new question.