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There are 30 objective-type questions in an examination. For every correct answer, a student scores 5 marks and for very incorrect answer, 3 marks are deducted. If a student attempts all the questions and scores 94 marks, find how many questions he answered correctly.

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The objective of telescope has diameter 12 cm. The distance at which two small green object placed 30 cm apart can be barely resolved by telescope, assuming the resolution to be limited by diffraction by objective only (lamda=5.4xx10^(-5)cm)

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