Question

a student holding a mirror in his hand, directed the reflecting surface of the mirror towards the sun. He then directed the reflected light on to a sheet of paper held close to the mirror. (a) What should he do to burn the paper? (b) Which type of mirror does he have?(c) Well he be able to determinethe approximate value of focal length at this mirror from this activity? Give reason and draw a ray diagram to justify your answer in this case.

Answer 1

Answer:

1. he should place the sheet of paper at the focus of the mirror to burn the paper.
2. She has a concave mirror
3. Yes, the sheet of the paper will start burning at the focus of the mirror which will give approximate value of the focal length ,i.e.,the distance between the mirror and the focal point where the sheet of a paper starts burning.

Above you have the attachment of the figures. these two figures are very different

• the first figure gives information about the sun and the burning of paper
• where as a second figure will give you the ray diagram.

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