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Indian Navy SSR The Human Eye and the Colourful World — practice questions

Explore 4 free The Human Eye and the Colourful World questions in Indian Navy SSR Physics. Open each question or exercise to read its content, reference answers and available explanation.

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The Human Eye and the Colourful World questions and exercises with answers

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Which defect of vision is corrected by a concave lens?Read the answer and worked solution →Two convex lenses of focal lengths 20 cm and 50 cm are placed in contact. The power of the combination is:Read the answer and worked solution →The Tyndall effect refers to the:Read the answer and worked solution →Why do planets NOT twinkle though stars do?Read the answer and worked solution →

Worked practice questions

Which defect of vision is corrected by a concave lens?

  1. Hypermetropia (long-sightedness)
  2. Myopia (short-sightedness)
  3. Presbyopia
  4. Astigmatism
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Correct answer: B. Myopia (short-sightedness)

1. Myopia means the eye can focus only on nearby objects. 2. Distant rays form an image before the retina. 3. A concave (diverging) lens spreads the rays before they enter the eye. 4. The image then forms on the retina. 5. So myopia is corrected by a concave lens. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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Two convex lenses of focal lengths 20 cm and 50 cm are placed in contact. The power of the combination is:

  1. +5 D
  2. +9 D
  3. +7 D
  4. +10 D
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Correct answer: C. +7 D

1. Power of a lens P = 1 / f (in metres). 2. P1 = 1 / 0.20 = 5 D and P2 = 1 / 0.50 = 2 D. 3. For lenses in contact, the combined power is P = P1 + P2. 4. P = 5 + 2 = 7 D. 5. So the answer is +7 dioptres. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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The Tyndall effect refers to the:

  1. Scattering of light by colloidal particles
  2. Reflection from a mirror across all cases
  3. Total internal reflection
  4. Refraction through a prism
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Correct answer: A. Scattering of light by colloidal particles

1. A colloidal solution has particles bigger than molecules but small enough to stay suspended. 2. When light passes through such a colloid, the particles scatter it. 3. The path of the light becomes visible as a bright streak. 4. This visible streak is called the Tyndall effect. 5. Examples include sunlight through forest canopy and a torch beam in misty air. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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