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27 Cards in this Set
- Front
- Back
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An incident ray travels from Medium 1 to Medium 2. Describe what would happen to the ray if Medium 1 is Air Medium 2 is olive oil. |
The ray would be refracted TOWARDS the normal. |
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An incident ray travels from Medium 1 to Medium 2. Describe what would happen if Medium 1 is glass and Medium 2 is water. |
The ray would be refracted AWAY from the normal. |
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What is the constant speed of light in a vacuum? |
3.00 x 10^8 m/s |
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When does refraction occur (i.e., under what circumstances does it happen)? |
When light hits a different medium |
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Is the speed of light constant? Explain. |
Light travels in straight lines but the speed it travels depends on the medium it goes through. Each medium has a different density which either speeds up/slows down the light - giving each medium its own index of refraction. |
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What two conditions must be fulfilled in order for total internal reflection to occur? |
1. The angle of incidence is greater than the critical angle. 2. Light is travelling slower in the first medium than the second. |
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Why does total internal reflection occur only when light travels more slowly through the first medium than in the second and not the other way around? |
- When moving towards a faster (less dense) medium, the light refracts away from the normal. - Moving to a more dense medium would cause light to bend towards the normal, making its critical angle beyond 180 degrees. |
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How does the index of refraction for a medium relate to the speed of light in that medium? |
The closer the medium is to the constant (3 x 10^8), the smaller the index of refraction, the faster the light travels through the medium = less dense medium. |
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A concave lens is also known as a __ __. |
Diverging lens |
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A convex lens is also known as a __ __. |
Converging lens. |
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A convex mirror is also known as a __ __. |
Diverging mirror |
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A concave mirror is also known as a __ __. |
Converging mirror |
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The centre of the lens is called the __ __. |
Optical Centre |
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Lenses have __ focal point(s) |
Two |
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Mirrors have __ focal point(s) |
One |
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How are mirrors represented in a ray diagram? |
A line to represent the glass, and diagonal lines to represent the back of the mirror. |
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The three rays used to determine an image for a CONCAVE MIRROR are: |
1. In parallel to the principle axis, out through F 2. In through F, out parallel 3. In through the top of the object, out at the same angle |
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Media with smaller indexes of refraction are "denser" (T/F) |
False |
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All substances have the same critical angle (T/F) |
False |
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Binoculars make use of two carefully placed mirrors (T/F) |
False |
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Lenses have more than one focal point (T/F) |
True |
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An anglerfish demonstrates bioluminescence. (T/F) |
True |
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The angle between the incident ray is called the angle of incidence. (T/F) |
True |
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When the incident light is at the critical angle, the refracted light is at 90 degrees. |
True |
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It is possible for light to travel at a speed of 4 x 10^8 m/s in water |
False |
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What is a real image? |
A real image can be projected onto a screen and isn't found in the medium (i.e. a real image doesn't appear to be behind a mirror) |
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What is a virtual image? |
A virtual image cannot be projected onto a screen. They're found in the medium of reflection/refraction (i.e. a virtual image is one that appears to be behind the mirror |
