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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2025 · Paper I, General Studies · Q18 of 120

Geo-Scientist Prelims 2025 General Studies Q18: A glass bar (refractive index = 1·5) is immersed in a liquid having…

QuestionOptics / Brewster angle

A glass bar (refractive index = 1·5) is immersed in a liquid having the same refractive index as that of glass. The angle of incidence for a light ray at which the light would be transmitted through the glass bar without reflecting is

  1. (a) 30°
  2. (b) 45°
  3. (c) 60°
  4. (d) 75°

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