1. What evidence do you have that light travels in straight lines?
Light travels in straight lines by traveling in a wave. Light travels through anything ‘transparent’, fastest through vacuum. (Also, the fact that shadows are right behind the object blocking the sun, proves that light travels in straight lines)
2. In the top right hand drawing, imagine that the lamp represents the sun, the cell represents the moon, and the screen is the earth. Make a drawing to show the places on the earth where you would see a partial eclipse and a total eclipse of the sun.
The picture belows top image is a total eclipse and the bottom image is a partial eclipse
3. When light is reflected in a mirror, what is special about the angle of the incident and reflected rays?
The angle of the incident and reflected rays reflected in a mirror become equal to each other
4. Where is the image when you look at something in a mirror?
The image appears to be behind the mirror, when you look at something in a mirror.
5. Light travels in straight lines. If you hide just round a corner so that you can’t see your friends, can they see you?
Sorry, I couldn’t find a way to answer this question…
Reflections by different surfaces (p. 97)
1. What can you see in a completely dark room?
It’s obvious, you can’t see anything, but, sometimes you can figure out some figures.
2. If you place a lamp in this dark room as a light source, explain how you could now see:
a) The lamp: you could see the lamp in a dark room when the lamp is placed as a light source because it is beams of light
b) A piece of white paper: you can see the paper in a dark room when the lamp is placed because papers surface is rough, due to this, when light ‘hits’ paper with various angles the beams goes to different places, and so light becomes reflected from the paper, but scattered beams, not a single beam, therefore we can see the paper
3. What types of mirror could you use for make-up or shaving? What would be the advantages of each type?
When using concave mirrors, you can see a focus point clearly, the image looks bigger, therefore see all pieces of hair when shaving and see smudges or mistakes in make-up.
And when using convex mirrors, they make your face look smaller, and you can see your face in general to see if an opponent can see if you made mistakes in make-up or shaved properly.
4. If a driver has one convex, and one plane rear-view mirror, how would the images in each appear different?
The convex rear mirror would allow you to see closer to the back, but this may confuse the driver, whereas the plane mirror would just allow you to see the normal image, the same size as the actual object or thing.
5. Why could you not use a concave mirror as a rear-view mirror?
You would not use a concave mirror, because rear-view mirrors are supposed to help you see the rear closely, to make it nearer, but concave mirrors make the image look zoomed out, bigger.
6. List as many different uses as you can for plane, convex and concave mirrors
Plane mirrors basically make you see an object as it is exactly, so it would help you to see yourself how tall, fat, thin, short you are.
Convex mirrors help you see closer, therefore you could use it to look at writing you couldn’t read.
Concave mirrors help you see a bigger view, thus it should let you see a full image in a small space of mirror, or the area you’re in.
(I couldn't think of too many so I put it in this format)
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