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NCERT Class 10 Science The Human Eye and the Colourful World: In-text questions (page 164) Solutions

AI-written, checked on 23 Oct 2026

Solutions written by Shishya, checked — not the board's official answers

Step-by-step working for every question of In-text questions (page 164) in NCERT's Class 10 Science book, chapter “The Human Eye and the Colourful World”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.

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  1. In-text (page 164) Q1

    What is meant by the power of accommodation of the eye?

    1. The eye has a lens that can change its shape to focus light on the retina.
    2. This ability to adjust the focal length of the eye lens is called the power of accommodation.
    3. It allows the eye to focus clearly on objects at varying distances, from near to far.
    4. The ciliary muscles contract or relax to change the curvature of the lens.

    Answer: The power of accommodation is the ability of the human eye to adjust its focal length to focus on objects at different distances.

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  2. In-text (page 164) Q2

    A myopic person cannot see beyond 1.2 m clearly. What type of corrective lens should be used?

    1. The person is myopic, meaning their eye focuses light from distant objects in front of the retina.
    2. To correct this, the eye needs a lens that diverges light rays before they enter the eye.
    3. A diverging lens is a concave lens.
    4. The far point of this person is 1.2 m, which acts as the virtual image distance for the corrective lens.
    5. Thus, a concave lens with a focal length of 1.2 m (or -1.2 m) is required to shift the focus back to the retina.

    Answer: A concave lens should be used.

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  3. In-text (page 164) Q3

    What are the far point and near point of a normal human eye?

    1. A normal human eye can focus on objects placed at a minimum distance of 25 cm from the eye.
    2. This minimum distance is called the near point of the normal eye.
    3. A normal human eye can also focus on objects placed at a maximum distance of infinity.
    4. This maximum distance is called the far point of the normal eye.

    Answer: The near point is 25 cm and the far point is infinity.

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  4. In-text (page 164) Q4

    A student in the last row has difficulty reading the blackboard. What defect could it be, and how is it corrected?

    1. The student cannot see distant objects clearly, which indicates the defect of myopia or near-sightedness.
    2. In this condition, the image of distant objects is formed in front of the retina instead of on it.
    3. This happens because the eye lens becomes too thick or the eyeball becomes too long.
    4. To correct this defect, a diverging or concave lens is used.
    5. The concave lens diverges the light rays before they enter the eye.
    6. This ensures that the image is formed exactly on the retina, allowing clear vision of distant objects.

    Answer: The defect is myopia, and it is corrected by using a concave lens.

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