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[18]Waves, Sound, and Light 7Â÷ ¹Ì¼Ç

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µî·ÏÀÏ 2013-03-21 00:55

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1. Where is the focal point in a convex mirror?

 

 

 

2. Light bounces off the surface of the mirror. But you can't see anything. How could that be?

 

 

 

 

 

 

To be answered by 3/31 after reading chap4.1(113~118p)


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alsxmthsu 2013-04-05 16:14 

1. Focal point of a convex mirror is placed behind the conves mirror when lights meet.

 

2. We can't see light but we can see the images that lights are reflected from. Lights are reflected with mirror and it comes into our eyes. So instead we see the lights we can see images.

Erin37 2013-03-31 21:58 

1. A focal point is a point at which the rays meet, but rays reflected from a convex mirror move away from each other once reflected. So the rays never meet, and a focal point does not exsist.

2. The lights reflected off a mirror is sent into the eyes. When you look into a mirror, the lights that in sent into the eyes is a image. So you can't see lights, you can see images.

annie0717 2013-03-31 20:36 

1. A focal point is the point at which the rays meet, and the distance between the mirror and it depends on the shape of the curve. In the case of a concave mirror, the focal point is close to the mirror. In the case of a convex mirror, a focal point does not exist. Since a convex mirror is curved outward, the light ray bounce off the mirror and go straight outward, and do not meet forever.

2. When light bounces off a mirror, it comes into our eyes and we see what is in the mirror; our reflection. Unlike most objects, a mirror makes a reflection of the object or person in front of it, and that is how we get to see our reflection in front of a mirror.

directioner 2013-03-30 22:45 

1. Let's learn about focal point first. According to the book, it says that the point at which they rays meet is called the focal point of the mirror. Unlike just flat mirror, Convex mirror is curved outward, so when the light rays reaches the Convex mirror, it moves away from each other. So, I think that the Convex mirror doesn't have a focal point, because the light moves away from each other when it arrives at the convex mirror, so it will never meet. Well, I'm not so sure, but I think that there is no focal point in a convex mirror.

2. When you look into the mirror, you see your reflection, or you can say it 'image', which is a picture of an object formed by waves of light, so I think if the light is reflected by something, it is transfered into an image and reaches our eyes.

ºû³ª´ÂÁö 2013-03-23 21:40 

1. If light arrives at the convex mirror, it reflects and go towards the outside. It speads. We can find the mirror's focal point if we extend the line that represents the spreading(reflected) light.It is in the other side of the mirror(different side from where the light comes and bounces).

2. A mirror's surface is smooth, so it does regular reflection. Light rays that comes from the same direction will bounce off in the same new direction. You can only see it if you are in one certain direction, unlike diffuse reflection, that you can see the thing from every direction.


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