Parallel rays of sun light meet at a point in the form of a spot of a light on a black paper after 1)What is the distance between the pole of the concave mirror and the paper? 2)What will happen to the paper if the spot of light remains at that point for few minutes ? 3)Give reason for the observation.
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Parallel rays of of sunlight meet at a point in the form of a spot of light on a black paper with the help of a concave mirror.
1. What is the distance between pole of concave mirror and the paper?
In this case , the distance between pole of concave mirror and the paper is the focal length of the concave mirror.
Reason:
Paraxial light rays from the Sun after getting reflected from the concave mirror meet at the focus to form a spot , when the black paper is kept at the focus.
2. What will happen to the paper if the spot of light remains at that point for few minutes?
If the spot of light is kept on the black paper for a few minutes, the black paper will start burning.
This is because :
Reflection from the concave mirror led to concentration of all the the light rays from the sun at the focus such that a large heat it is generated leading to to burning of the paper.
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