1. Explain total internal reflection (don\'t forget to discuss the critical angl
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Question
1. Explain total internal reflection (don't forget to discuss the critical angle). Discuss a common application of this phenomena.
2. Explain the construction of the image in a thin, converging lens.
3. Explain the construction of the image in a thin, diverging lens
4. Explain the construction of the image in a concave mirror
5. Explain the construction of the image in a convex mirror
6. Explain what happens when you "focus a camera"
7. Discuss the concept of apparent size and give an example.
8. Discuss the dispersion of white light through a prism.
Explanation / Answer
When a ray of light is incident at the boundary of two objects of differing refractive index, its further travel is guided by certain conditions. If the the light strikes at an angle greater than the critical angle then the light will be bent so much by the medium outside that it will simply return back into the original medium. This means that the ray of light never escapes out the original medium.
Application fiber optics. The entire internet transmission is built around this.
In a thin converging lens the rays of light that pass throught the center of the lens go undeviated. While the ones that pass through the egde conerge towards towards to the center.
In a thin diverginf lens the ray of light that passes through the center again goes undeviated, while the ray of light that goes through the edge is diverged. The ray is retraced backwards and a virtual image is formed.
In a concae mirror all the rays at the edges reflect inwards and converge at a common focal point.
In a convex mirror all the rays striking the edge diverge away from it and a virtual image forms on the backside of the mirror.
When you focus the image you ensure that the focal point of lens coincide. The focal point behind the first lens and the focal oint in front of the second lens should coincide.
Apparent size is the size of the object that you see and not the actual one. The floor of a swimming pool appears to be raised caused due to refraction.
A while light id composed of all 7 visible colors. But when the light is passed through a prism, all of the rays are sujected to refraction. This changes angle taken by each ray and causes a distance difference between each color. This causes the to separate and henc you see 7 colors at the end.
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