College Physics
College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Concept explainers

Question
Chapter 22, Problem 1RQ
To determine

The reason why light is projected upside down on the wall behind the screen, when the light source is placed in the front of a screen with a small hole.

Expert Solution & Answer
Check Mark

Answer to Problem 1RQ

Solution:

Light always travels in straight line, so it has to cover the same distance in same time. Due to this, the rays from the bottom portion of the light source pass through the hole and reach the wall, and other rays from the top portion of the light reach the wall but below the wall and it forms an inverted image on the wall.

Explanation of Solution

Introduction:

Experimentally, it has been observed that, the projection on the wall will be upside down when a light source placed in front of screen with a small hole, because the light always travels in straight line through the small hole.

Explanation:

From the schematic diagram shown below, consider the ray 1 passes from the bottom of the flame and the ray 2 passes from the top of the flame. The ray 1 passes from the bottom of the flame, reaches the wall on some distances from the wall in a dark room, and a stiff paper with small hole is placed in between the candle and wall.

College Physics, Chapter 22, Problem 1RQ

If source of light sends the light in all direction; from the source of light, multiple rays will emit and reaches to stiff paper. In addition, due to stiff paper, some light rays were blocked and some lights were reached on screen from the top and the bottom portion of light source.

In such a way, the rays from the bottom portion of the light pass through the hole and reach the wall, and other rays from the top portion of the light reach below the wall where the light rays can be seen in the above diagram. Because the light always travels in straight line, so it has to cover same distance in same time. And due to this, the projection will be seen on the wall upside down.

Conclusion:

The projection will be upside down because the light always travels in straight line through the small hole. And due to this, the rays from the bottom portion of the light pass through the hole and reach to the wall, and other rays from the top portion of the light reach the wall but below where the light rays from bottom portion did, it can be seen in the above diagram.

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Chapter 22 Solutions

College Physics

Ch. 22 - Prob. 5MCQCh. 22 - You fix a point-like light source 3.0m away from a...Ch. 22 - Prob. 7MCQCh. 22 - A light ray travels through air and then passes...Ch. 22 - 9. A right triangular prism sits on a base A...Ch. 22 - 10. A laser beam travels through oil in a...Ch. 22 - Prob. 11MCQCh. 22 - Prob. 12MCQCh. 22 - What effects of light radiation and reflection are...Ch. 22 - Prob. 14CQCh. 22 - Prob. 15CQCh. 22 - Explain how a sundial works (a sundial is just a...Ch. 22 - Prob. 17CQCh. 22 - Prob. 18CQCh. 22 - Prob. 19CQCh. 22 - Prob. 20CQCh. 22 - Prob. 21CQCh. 22 - The visible diameters of the Moon and the Sun are...Ch. 22 - The shadow of the Moon on Earth is 200 km wide....Ch. 22 - Prob. 24CQCh. 22 - 25. During the day, you can see the trees in your...Ch. 22 - 26. You look at a fish underwater Draw a ray...Ch. 22 - 27. Take a pencil and try to touch a penny on the...Ch. 22 - 28. Will a beam of light experience total internal...Ch. 22 - Prob. 29CQCh. 22 - Prob. 30CQCh. 22 - Prob. 31CQCh. 22 - Prob. 32CQCh. 22 - 33. What phenomena can be explained using a wave...Ch. 22 - How is it possible that two different models can...Ch. 22 - Oliver has finished building a wall in a house. He...Ch. 22 - Tree height You are standing under a tree. The...Ch. 22 - Lunar eclipse A lunar eclipse happens when the...Ch. 22 - * Shadows during romantic dinner You and a friend...Ch. 22 - * Pinhole camera (camera obscura) You want to make...Ch. 22 - 6. * Solar eclipse Only observers in a very narrow...Ch. 22 - Prob. 7PCh. 22 - An extended light source can be modeled as a group...Ch. 22 - * You have a small mirror. While holding the...Ch. 22 - Prob. 11PCh. 22 - 12. Design a mirror arrangement so that light from...Ch. 22 - Two mirrors are oriented at right angles. A narrow...Ch. 22 - Prob. 14PCh. 22 - A flat mirror is rotated 17 about an axis in the...Ch. 22 - (a) A laser beam passes from air into a 25 glucose...Ch. 22 - 17. A beam of light passes from glass with...Ch. 22 - A beam of light passes from air into a transparent...Ch. 22 - 19. * Moving laser beam An aquarium open at the...Ch. 22 - **Lifting light You have a V-shaped transparent...Ch. 22 - Prob. 21PCh. 22 - Prob. 22PCh. 22 - 23. * BIO Vitreous humor Behind the lens of the...Ch. 22 - Prob. 24PCh. 22 - * Light moving up and toward the right in air...Ch. 22 - * A laser beam is incident at 30 with respect to...Ch. 22 - * Can your light be seen? You swim under water at...Ch. 22 - * Light is incident on the boundary between two...Ch. 22 - 29. Diamond total reflection Determine the...Ch. 22 - Determine the refractive index of a glucose...Ch. 22 - * You wish to use a prism to change the direction...Ch. 22 - * You aim a laser beam (in air) at 80.0 with...Ch. 22 - 33. * Prism total reflection What must be the...Ch. 22 - Gems and critical angles In gemology, two of the...Ch. 22 - (a) The refractive index for the gem aquamarine is...Ch. 22 - 36. * You have three transparent media with...Ch. 22 - 37. (a) Rays of light are incident on a glass-air...Ch. 22 - 42. ** When reaching a boundary between two media,...Ch. 22 - 43. * A laser beam travels from air (n = 1.00)...Ch. 22 - . You sit on a raft and want to orient a mirror so...Ch. 22 - 45. ** Rain sensor Many cars today are equipped...Ch. 22 - Prob. 46PCh. 22 - Prob. 47PCh. 22 - 48. A light ray is incident on a flat piece of...Ch. 22 - 49. * Prism You have a triangular prism made of...Ch. 22 - * You have a candle and a large piece of paper...Ch. 22 - 52. * You place a point-like source of light at...Ch. 22 - 53. ** There is a light pole on one bank of a...Ch. 22 - 54. ** Coated optic fiber An optic fiber of...Ch. 22 - relative to the normal, hits the mirror, reflects,...Ch. 22 - 56. ** A scuba diver stands at the bottom of a...Ch. 22 - Prob. 57RPPCh. 22 - Rainbows How is a rainbow formed? Recall that the...Ch. 22 - Rainbows How is a rainbow formed? Recall that the...Ch. 22 - Prob. 60RPPCh. 22 - Prob. 61RPPCh. 22 - Rainbows How is a rainbow formed? Recall that the...Ch. 22 - Prob. 63RPPCh. 22 - Prob. 64RPPCh. 22 - Rainbows How is a rainbow formed? Recall that the...Ch. 22 - Prob. 66RPPCh. 22 - Prob. 67RPPCh. 22 - Prob. 68RPP
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