When a spherical lens is held towards the sun and q sharp image is formed on a piece of a black paper, a hole gets burnt in the black paper, after sometime. 1. Name the lens used in above activity. 2. What name is given to the distance between the spherical lens and the black paper. 3. What is the relative advantage of using a black paper rather than a white paper?
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(1). Convex lens is used to form image of the sun for observation .
(2). Focal length is the term given to the distance between the spherical lens and the black paper .
(3). Black paper is effective then white paper because black color absorbs heat more easily then white color and we can get the hole faster .
- Convex lens is a converging lens .
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i think you are in 8th class right
When a spherical lens is held towards the sun and q sharp image is formed on a piece of a black paper, a hole gets burnt in the black paper, after sometime. 1. Name the lens used in above activity. 2. What name is given to the distance between the spherical lens and the black paper. 3. What is the relative advantage of using a black paper rather than a white paper?
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