One half of a convex lens is covered with black paper.Will the lens produce a complete image of object?verify your answer experimentally.
Answers
Yes a complete image of the object would be produced
Explanation:
Materials Required:
- Meter scale
- Convex Lens
- Black Paper
Procedure:
1) Take a meter and place it in horizontal position against a white wall with 0 cm end touching the wall.
2) Take a convex lens and focus light from distant object like a tree adjusting the lens according to the meter scale to get a proper measurement.
3) By doing this we get a sharp image of the tree formed at the wall at a distance equal to the focal length of the convex lens
4) Cover the long or the top portion of the lens with black paper.
5) Again focus the same tree on the wall with the help of the convex lens.
A complete image of the tree is formed but with less intensity on the wall from the same point on the meter scale.
Answer:
a point on the Object need only two rays to form an image. since the entire lense is not covered at least two rays from each point does pass through the lense and hence image is formed. however since the number of rays involved in the image formation reduces as the lense covered the image formed is of lesser intensity aand less brighter . .
experiment
apparatus needed convex lense candle two black sheet of paper . .
procedure..
mount a lense in a table , light a candle with a match stick and place it on one side of the lense on the table. . turn of the lights of the roomso that it gets dark. take the sheet of paper and place it's on the other side of the lense as the candle.now focus the image formed on the sheet of paper by moving the sheet only . observe the image . mark the position of candle , lense and secreen . now turn off the light . . take the lense and cover half of it with the second sheet of black paper . mount the lense on the table in the original position and repeat the above experiment ...
observation
a focused image is obtained in the both the experiments.. however the image formed with half the lense covered is bright as compared to when it is uncovered...
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