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Question: Consider the following phenomena:
1. Size of the sun at dusk
2. Colour of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?

1)1, 2 and 3
2)3, 4 and 5
3)1, 2 and 4
4)2, 3 and 5

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Exam Exam: CSAT IAS 2013

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