Which of the following phenomena is not the result of total internal reflection ?a)Twinkling of starsb)Miragec)Loomingd)both Looming and Twinkling of starsCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Twinkling of stars is due to atmospheric refraction. Distant star acts like a point source of light. When the Starlight enters the earth's atmosphere it undergoes refraction continuously, due to changing refractive index ie. From rarer to denser medium.

Answer

B) Mirage is an optical illusion caused by the phenomenon of total internal reflection of light.

c) Looming is also due to total internal reflection.

a) The atmospheric refraction is responsible for twinkling of stars. As the light from the stars enters the earth’s atmosphere it suffers refraction and cause the twinkling.

Hence option @ is correct answer .

Answer

Twinkling of stars

Answer

Because twinkling of star is a result of atmospheric refraction

Answer

Explanation:

Total internal reflection is a phenomenon that occurs when light rays traveling from a denser medium to a less dense medium are reflected back to the denser medium at the boundary between the two media. This phenomenon occurs when the angle of incidence of the light ray is greater than the critical angle.

The following are the phenomena that are the result of total internal reflection:

1. Mirage:
Mirage is an optical illusion that occurs due to the refraction of light rays passing through layers of air of different densities. The lower layers of air are denser due to the increase in temperature, which causes the light rays to bend upwards away from the normal. Total internal reflection occurs when the angle of incidence of the light ray is greater than the critical angle, and the light ray is reflected back towards the ground, making the observer see an image of the sky on the ground.

2. Looming:
Looming is a phenomenon that occurs when an object appears to be lifted above its actual position. This is caused by the bending of light rays as they pass through layers of air of different densities. Total internal reflection occurs when the angle of incidence of the light ray is greater than the critical angle, and the light ray is reflected back towards the observer, making the object appear to be higher than it actually is.

3. Twinkling of stars:
Twinkling of stars is caused by the refraction of light rays as they pass through the Earth's atmosphere, which is composed of layers of air of different densities. The density of the air varies due to changes in temperature, pressure, and humidity. Total internal reflection does not occur in this phenomenon.

4. Rainbow:
Rainbow is an optical phenomenon that occurs when sunlight is refracted, reflected, and dispersed in water droplets in the atmosphere. The light rays are refracted as they enter the water droplets and then reflected back towards the observer. This phenomenon is not the result of total internal reflection.

Conclusion:

Therefore, the correct answer is option 'A' - Twinkling of stars. Twinkling of stars is caused by the refraction of light rays in the Earth's atmosphere and not the result of total internal reflection.

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