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Indian Navy AA (Artificer Apprentice) The Human Eye and the Colourful World — practice questions

Explore 4 free The Human Eye and the Colourful World questions in Indian Navy AA (Artificer Apprentice) 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 1–4 of 4.

The least distance of distinct vision for a young adult is approximately:Read the answer and worked solution →Myopia is corrected using a:Read the answer and worked solution →Presbyopia arises because:Read the answer and worked solution →A child cannot read words on the blackboard clearly. The likely defect and correction are:Read the answer and worked solution →

Worked practice questions

The least distance of distinct vision for a young adult is approximately:

  1. 25 cm
  2. 50 cm
  3. 10 cm
  4. 100 cm
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Correct answer: A. 25 cm

1. The near point of a normal young adult is about 25 cm. 2. Objects held closer cannot be focused sharply because the lens cannot increase curvature further. 3. This 25 cm distance is the least distance of distinct vision. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.1.1_

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Myopia is corrected using a:

  1. Cylindrical lens
  2. Convex lens of suitable power
  3. Concave lens of suitable power
  4. Plane glass
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Correct answer: C. Concave lens of suitable power

1. In myopia the image of a distant object forms in front of the retina. 2. A concave (diverging) lens shifts the image backward onto the retina. 3. The correct power of concave lens depends on the far point of the myopic eye. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.2_

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Presbyopia arises because:

  1. The ciliary muscles weaken and the lens loses flexibility with age
  2. The retina detaches
  3. The optic nerve thickens (option)
  4. The iris loses pigment
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Correct answer: A. The ciliary muscles weaken and the lens loses flexibility with age

1. Presbyopia is an age-related loss of accommodation. 2. It is caused by weakening of ciliary muscles and reduced lens flexibility. 3. Near vision becomes hard; reading glasses (convex lenses) are needed. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.2_

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