NCERT Example 9.6 - Ray Optics and Optical Instruments
Question: Answer the following: (a) When a low-flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Why? (b) The sun is seen before actual sunrise and after sunset. Explain.
Answer: (a) **Interference** of direct and reflected TV waves. (b) **Atmospheric refraction** makes the sun visible before sunrise/after sunset.
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