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Test: The Human Eye & the Colorful World - 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: The Human Eye & the Colorful World - 1

Test: The Human Eye & the Colorful World - 1 for UPSC 2025 is part of Science & Technology for UPSC CSE preparation. The Test: The Human Eye & the Colorful World - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: The Human Eye & the Colorful World - 1 MCQs are made for UPSC 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: The Human Eye & the Colorful World - 1 below.
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Test: The Human Eye & the Colorful World - 1 - Question 1

The deflection of light by minute particles and molecules of the atmosphere in all direction is called___________of light.

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 1

Scattering of light occurs when light deflects in all directions due to interactions with tiny particles and molecules in the atmosphere.

  • It is responsible for the blue colour of the sky.
  • This phenomenon occurs because shorter wavelengths of light (like blue) are scattered more than longer wavelengths (like red).
  • Scattering is crucial in understanding various atmospheric and optical phenomena.
Test: The Human Eye & the Colorful World - 1 - Question 2

Which of the following diagrams represents refraction of light through a prism correctly ?

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 2

The diagram (iv) represents the correct path of fight ray passing through a prism. On account of refraction through a prism, a light ray bends towards the base of the prism.

Test: The Human Eye & the Colorful World - 1 - Question 3

Stars twinkle due to

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 3

Stars appear to twinkle due to atmospheric refraction. This phenomenon occurs because:

  • The Earth's atmosphere is composed of layers with varying densities.
  • These layers cause the starlight to bend as it passes through.
  • The bending of light makes stars seem to shift and flicker.
Test: The Human Eye & the Colorful World - 1 - Question 4

When white light passes through a glass prism

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 4

When white light passes through a glass prism, the violet coloured ray undergoes maximum deviation. The red coloured ray undergoes minimum deviation.

Test: The Human Eye & the Colorful World - 1 - Question 5

The image formed on the retina of the human eye is

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 5

Eye lens is convex, in nature. So, image formed by it on the retina is real and inverted.

Test: The Human Eye & the Colorful World - 1 - Question 6

Refraction of light by the earth’s atmosphere due to variation in air density is called

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 6

Atmospheric refraction is the bending of light as it passes through the Earth's atmosphere. This phenomenon occurs due to changes in air density.

  • Light travels through air of varying densities, causing it to bend.
  • This bending makes celestial objects appear higher than their actual position.
  • Common examples include the apparent position of the sun during sunrise and sunset.
Test: The Human Eye & the Colorful World - 1 - Question 7

When a ray of light passes from a rarer medium (air) to a denser medium (glass), which of the following phenomena occurs?

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 7

When light travels from a rarer medium (like air) to a denser medium (like glass), its speed decreases because the denser medium has a higher optical density. As a result, the light ray bends towards the normal at the point of incidence due to refraction. This behavior is described by Snell's law, which relates the angles of incidence and refraction to the refractive indices of the two media.

Test: The Human Eye & the Colorful World - 1 - Question 8

When white light enters a prism, it gets split into its constituent colours. This is due to

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 8

Dispersion takes place because refractive index of the material of prisra is different for different wavelength.

Test: The Human Eye & the Colorful World - 1 - Question 9

Which of the following phenomena of light are involved in the formation of a rainbow ?

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 9

Phenomena of refraction, dispersion and internal reflection are involved in the formation of rainbow.

Test: The Human Eye & the Colorful World - 1 - Question 10

When a beam of white light passes through a glass prism, it splits up into seven colours. This phenomenon is due to

Detailed Solution for Test: The Human Eye & the Colorful World - 1 - Question 10

 Splitting of white light into its constituent seven colours, while passing through a prism, is on account of dispersion of fight.

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