12th Class Physics Ray Optics Question Bank Ray Optics Conceptual Problems

  • question_answer
    Only the stars near the horizon twinkle while those overhead do not twinkle. Why?

    Answer:

                    Light from the stars near the horizon reaches the earth obliquely through the atmosphere. Its path changes due to refraction. Frequent atmospheric disturbances change the path of light and cause twinkling of stars. Light from the stars overhead reaches the earth normally. It does not suffer refraction. There is no change in its path. Hence there is no twinkling effect.


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