| 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? |
A) 1, 2 and 3
B) 3, 4 and 5
C) 1, 2 and 4
D) 2, 3 and 5
Correct Answer: C
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