Which one among the. following figures correctly represents the ray diagram ? (Consider the lens to be thin)

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NDA-II 2024 (GAT) Official Paper (Held On: 01 Sept, 2024)
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  1. qImage67dbaf0415a58cb4d35b3512
  2. qImage67dbaf0515a58cb4d35b3513
  3. qImage67dbaf0515a58cb4d35b3514
  4. qImage67dbaf0615a58cb4d35b3517

Answer (Detailed Solution Below)

Option 3 : qImage67dbaf0515a58cb4d35b3514
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NDA 01/2025: English Subject Test
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Detailed Solution

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CONCEPT:

Ray Diagrams for Lenses

  • A ray diagram shows the path of light rays as they pass through a lens.
  • There are three primary rays used to construct a ray diagram for a thin lens:
    • Ray parallel to the principal axis: This ray refracts through the lens and passes through (or appears to pass through) the focal point on the opposite side.
    • Ray through the center of the lens: This ray passes straight through the lens without changing direction.
    • Ray through the focal point: This ray refracts through the lens and travels parallel to the principal axis.

EXPLANATION:

  • For a convex lens:
    • A ray parallel to the principal axis refracts and passes through the focal point on the other side.
    • A ray passing through the center of the lens does not change direction.
    • A ray passing through the focal point refracts and travels parallel to the principal axis.

qImage67e648e8153c38f1b79a41ff

qImage67e648e8153c38f1b79a4201

Therefore, the correct figure representing the ray diagram is Option 3.

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