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Indian Navy 10+2 B.Tech Cadet The Human Eye and the Colourful World — practice questions

Explore 3 free The Human Eye and the Colourful World questions in Indian Navy 10+2 B.Tech Cadet Science. 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

Showing questions 1–3 of 3.

A bifocal lens used for presbyopia + myopia has:Read the answer and worked solution →A rainbow always forms in the sky:Read the answer and worked solution →Planets do not twinkle as much as stars because:Read the answer and worked solution →

Worked practice questions

A bifocal lens used for presbyopia + myopia has:

  1. Upper convex portion and lower concave portion
  2. Upper concave portion and lower convex portion
  3. Two convex portions of equal power
  4. Two concave portions of equal power
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Correct answer: B. Upper concave portion and lower convex portion

1. Distant vision needs a concave lens, used for looking ahead — placed on top. 2. Near vision (reading) needs a convex lens — placed at the bottom. 3. The bifocal stacks the two together. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.2_

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A rainbow always forms in the sky:

  1. Only at noon
  2. Towards the Sun
  3. At the position of the Sun (option)
  4. In a direction opposite to the Sun
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Correct answer: D. In a direction opposite to the Sun

1. Sunlight enters water droplets, internally reflects once, and exits in the direction opposite to the Sun. 2. Observer sees the bow centred on the antisolar point. 3. Hence a rainbow appears opposite to the Sun in the sky. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.4_

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Planets do not twinkle as much as stars because:

  1. Planets emit their own light
  2. Planets appear as extended sources whose fluctuations average out
  3. Planets are closer than the atmosphere (option)
  4. Planets do not move
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Correct answer: B. Planets appear as extended sources whose fluctuations average out

1. Planets, being closer, are extended sources rather than point-sized. 2. Atmospheric refraction creates fluctuations from each point on the planet. 3. Sum of many random fluctuations averages out and the planet shines steadily. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.5_

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