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?
A1, 2 and 3
B3, 4 and 5
C1, 2 and 4
D2, 3 and 5
Answer & Solution
Correct answer: B. 3, 4 and 5
UPSC CSE Prelims 2013 (GS-I, Set A), Q.89. Official answer key: B.
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