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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium thorough-understanding
In which of the following situations does the straight-line (ray) model of light fail to give an accurate description? (A) Light passing through a large window and casting a sharp-edged shadow on the floor. (B) Light reflecting off a plane mirror to form an image. (C) Light bending around the edge of a very thin razor blade. (D) Light travelling through a glass slab and emerging on the other side.
  1. A Light passing through a large window and casting a sharp-edged shadow on the floor.
  2. B Light reflecting off a plane mirror to form an image.
  3. C Light bending around the edge of a very thin razor blade.
  4. D Light travelling through a glass slab and emerging on the other side.
Generated by claude-sonnet-4-6 · 2026-06-26 01:11 · grounding rag
Model Answer

(C) Light bending around the edge of a very thin razor blade.

When an opaque object becomes very small, light bends around it (diffraction), and the straight-line ray model fails.

Explanation

The passage explicitly states: "If an opaque object on the path of light becomes very small, light has a tendency to bend around it… an effect known as diffraction of light. Then the straight-line treatment of optics using rays fails." Options A, B, and D all involve phenomena (shadows, reflection, refraction through a slab) that are correctly explained by the ray model.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.