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the human eye and the colourful world — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencethe human eye and the colourful world1 Mark
MCQ
In the following ray diagram the correctly marked angles are.
  • A
    $\angle i$ and $\angle e$
  • B
    $\angle A$ and $\angle D$
  • C
    $\angle i$ ,$\angle e$ and $\angle D$
  • ✓
    $\angle r$, $\angle A$ and $\angle D$
✓

Answer

Correct option: D.
$\angle r$, $\angle A$ and $\angle D$
$\angle A$ represents the angle of a prism while $\angle D$ represents the angle of deviation and both are correctly marked.
As angle of refraction $(\angle r )$ is the angle formed by the refracted ray with the normal and is also correctly marked.
But $\angle i$ and $\angle e$ are the angles made by the incident ray with the normal and emergent ray with the normal respectively and thus are incorrectly marked. Hence option D is correct.

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