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IIT JEE 2006 Paper : PHYSICS Section I - Multiple Choice

Each question below has only one correct answer.
In the IIT-JEE, you will be awarded 3 marks for each correct answer and −1 for each incorrect answer.
You will be awarded 0 marks for not attempting a question.
Quiz Review
Multiple choice

Your Performance  

A biconvex lens of focal length  f forms a circular image of radius r of the sun in its focal plane. Then which of the following is correct?

  If lower half part is covered by black sheet, then area of the image is equal to πr 2 / 2

  πr 2 ∝   f

  If  f is doubled, intensity of the image will increase.

  πr 2 ∝   f 2

  Half-n-half Clue

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