Home Page Textbooks Nelson Science Perspectives 10 Page 486: Check Your Understanding

Nelson Science Perspectives 10

1st Edition

Christy C. Hayhoe, Doug Hayhoe, Jeff Major, Maurice DiGiuseppe

ISBN: 9780176355289

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Page 486: Check Your Understanding

Exercise 1

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Result

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What we can conclude from the diagram is that in the case of reflection incident angle which is the angle at which is incident ray falling at the surface, is equal to the angle at which it is reflected from the surface.

We can also see that incident ray, reflected ray and normal always lay in the same plane.

Exercise 2

Solution 1

Solution 2

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Two laws of reflection are:

1., Angle of incidence and angle of reflection are always equal.

2., The incident ray, the reflected ray and normal lie in the same plane.

Result

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1., Angle of incidence and angle of reflection are always equal.

2., The incident ray, the reflected ray and normal lie in the same plane.

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The 2 laws of reflection are:
1. The angle of incidence and the angle of reflection are always equal.
2. The incident ray, the normal and the reflected ray, all lie in the same plane (that is on the same side of the object and the 3 meet at the same point of incidence/reflection).

Exercise 3

Solution 1

Solution 2

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a. Specular reflection is caused by shiny and polished surface like metals where the beam of light rays incident on it is reflected from it in the same direction. It appears that the entire beam has reflected. This kind of reflection causes glare in the eye and the shiny and glossy surface appears to be the light source itself. In diffused reflection however, the different rays of the beam of light are incident and reflected of different points on a rough, irregular surface and hence the light beam appears to have diffused. (Note that the word rough here does not mean stone-rough, it means not polished, shiny or glossy. For example a nicely polished furniture surface is also rough under a microscope although it might seem smooth to touch.)

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b. Reflection of sunlight from a metallic car body can sometimes be specular. Reflection of light from a stone is an example of diffused reflection. We see objects comfortably because of diffuse reflection. Specular reflection causes glare in the eye.

Result

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Click to see answers.

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$textit{a.}$, Specular reflection is reflection on the smooth surfaces such as glass mirror etc.

After the specular reflection incident rays of light are reflected in the same direction they fell on the surface and it seems like the whole beam is reflected.

Diffuse reflection is reflection on the rough surfaces where the beam of light is being diffused since every ray hits different point on the rough surface.

$textit{b.}$, Examples:

Specular reflection is reflection of sunlight from the metallic surface of the car and diffuse reflection is reflection from the paper.

Result

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$textit{a.}$, Specular reflection is reflection on the smooth surface and beam of light is being reflected as a whole and it is reflected in the same direction it hit the surface and diffuse reflection is reflection on the rough surface where beam of light diffuses.

$textit{b.}$, Specular reflection: reflection of sunlight from the metallic surface of the car.

Diffuse reflection: reflection of light from the paper.

Exercise 4

Solution 1

Solution 2

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$textit{a.}$, Walls of the classrooms should be painted with a light colors so they could reflect light which will lead to well illumination which is good for a learning experience.

$textit{b.}$, Matt paint should be used since it will give dull appearance to the walls which will help in diffuse reflection.

Result

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$textit{a.}$, Walls of the classrooms should be painted with a light colors so they could reflect light which will lead to well illumination which is good for a learning experience.

$textit{b.}$, Matt paint should be used since it will give dull appearance to the walls which will help in diffuse reflection.

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a. Classrooms should be well illuminated to enhance the learning experience, therefore the walls should be painted with a light color to reflect light by diffuse reflection.

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b. Matte paint would be a good choice of paint here. This is because matte paint will give the walls its dull appearance to facilitate the diffuse reflection required for the class environment.

Result

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Exercise 5

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a. For an angle of incidence of $32text{textdegree}$, the angle of reflection must also be $32text{textdegree}$ according to the first law of reflection.

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b. For an angle of reflection of $47text{textdegree}$, the angle of incidence must also be $47text{textdegree}$ according to the first law of reflection.

Step 3

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c. If the incident ray makes an angle of $40text{textdegree}$ from the reflecting surface, then this implies that the angle of incidence is $90text{textdegree}-40text{textdegree}=50text{textdegree}$ and for an angle of incidence of $50text{textdegree}$, the angle of reflection must also be $50text{textdegree}$ according to the first law of reflection.

Result

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a. $32text{textdegree}$

b. $47text{textdegree}$

c. $50text{textdegree}$

Exercise 6

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Specular reflection is reflection on the smooth surfaces such as glass, mirror etc.

It can be used as an extra lightning and enhances brightness in the kitchen, bathroom or bedroom.

On the other hand diffuse reflection is reflection on the rough surfaces which are walls in these rooms diffuse lights that are too much bright.

Result

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Specular reflection can be used for better lightning and enhancing brightness of these rooms by applying mirrors, glass etc.

And diffuse reflection diffuse lights that are too bright, and main role in this have walls.

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