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Class 12 Exam  >  Class 12 Questions  >  Just before setting, the sun may appear to be... Start Learning for Free
Just before setting, the sun may appear to be elliptical. This happens due to:
  • a)
    Refraction
  • b)
    Dispersion
  • c)
    Reflection
  • d)
    Diffraction
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Just before setting, the sun may appear to be elliptical. This happens...
Refraction of light ray through the atmosphere may cause different magnification in mutually perpendicular directions.

Sunlight enters the Earth's atmosphere from the vacuum of space. The refractive index of air with respect to vacuum is 1.0029. This means that the speed of light in air is 1.0029 times slower than the speed of light in vacuum. This causes the light rays to bend towards the normal (refraction). 

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Just before setting, the sun may appear to be elliptical. This happens...
Refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed. For example, waves in deep water travel faster than in shallow. If an ocean wave approaches a beach obliquely, the part of the wave farther from the beach will move faster than that closer in, and so the wave will swing around until it moves in a direction perpendicular to the shoreline. The speed of sound waves is greater in warm air than in cold. At night, air is cooled at the surface of a lake, and any sound that travels upward is refracted down by the higher layers of air that still remain warm. Thus, sounds, such as voices and music, can be heard much farther across water at night than in the daytime.
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Read the following text and answer the following questions on the basis of the same:Diffraction in a hall:A and B went to purchase a ticket of a music programme. But unfortunately only one ticket was left. They purchased the single ticket and decided that A would be in the hall during the 1st half and B during the 2nd half.Both of them reached the hall together. A entered the hall and found that the seat was behind a pillar which creates an obstacle. He was disappointed. He thought that he would not be able to hear the programme properly.B was waiting outside the closed door. The door was not fully closed. There was a little opening.But surprisingly, A could hear the music programme.This happened due to diffraction of sound.The fact we hear sounds around corners and around barriers involves both diffraction and reflection of sound.Diffraction in such cases helps the sound to "bend around" the obstacles.In fact, diffraction is more pronounced with longer wavelengths implies that we can hear low frequencies around obstacles better than high frequencies.B was outside the door. He could also hear the programme. But he noticed that when the door opening is comparatively less he could hear the programme even being little away from the door. This is because when the width of the opening is larger than the wavelength of the wave passing through the gap then it does not spread out much on the other side. But when the opening is smaller than the wavelength more diffraction occurs and the waves spread out greatly – with semicircular wavefront. The opening in this case functions as a localized source of sound.Q. A and B could hear the music programme due to phenomenon named

Just before setting, the sun may appear to be elliptical. This happens due to:a)Refractionb)Dispersionc)Reflectiond)DiffractionCorrect answer is option 'A'. Can you explain this answer?
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Just before setting, the sun may appear to be elliptical. This happens due to:a)Refractionb)Dispersionc)Reflectiond)DiffractionCorrect answer is option 'A'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Just before setting, the sun may appear to be elliptical. This happens due to:a)Refractionb)Dispersionc)Reflectiond)DiffractionCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Just before setting, the sun may appear to be elliptical. This happens due to:a)Refractionb)Dispersionc)Reflectiond)DiffractionCorrect answer is option 'A'. Can you explain this answer?.
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