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Question 20: NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics
Answer the following questions:
(a) When a low-flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.
(b) As you have learnt in the text, the principle of linear superposition of wave displacements is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?
Solution:
(a) The low flying aircraft reflects the TV signals. Due to superposition between the direct signal received by the antenna and the reflected signals from aircraft. We sometimes notice slight shaking of the picture on the TV screen.
(b) Superposition principle states how to explain the formation of resultant wave by combination of two or more waves. Let and y2 represent instantaneous displacement of two superimposing waves, then resultant waves instantaneous displacement is given by
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics