b) A man carries a suitcase in his hand and climbs up the stairs. The work done by the man: i) Positive ii) Negative
iii) Zero iv) 9.8J
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facing the sun. She kept a white thick sheet of paper
on the table so that she could direct the rays from the devise X on to the paper. She moved the
paper back and forth till she could get the sharp image of the sun.
20.i. . Name and type of devise X.
20.ii. What is the distance between the devise and paper named as?
20.iii. Draw a schematic ray diagram of the following procedure.
20.iv. Write two precautions to be taken while doing this activity.
20.v. Give one more application of the same devise with well suited justification.
Explanation:
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