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Refraction and Total Internal Reflection for GSEB: 18 solved questions

Real GSEB paper questions on refraction and total internal reflection, part of ray optics and optical instruments. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2015 to 2023. No sign-in needed to read them.

What this topic asks

• Snell's law, slabs and apparent depth — 12 questions
• Total internal reflection and optical fibres — 6 questions

All 18 questions with solutions

• Depth of a well is 5.5 m and the refractive index of water is 1.33. If viewed normally from the top, by how m… GSEB Board July 2015; GSEB Board March 2020 (old course)
• A fish in a lake is at a 6.3 m distance from the edge of the lake. If it is just able to see a tree on the ed… GSEB Board July 2016
• A ray of light is travelling from a denser medium to a rarer medium. For these media the critical angle is C.… GSEB Board July 2017
• Which of the following is responsible for the glittering of a diamond? GSEB Board July 2017
• For a right angled prism, ray 1 is the incident ray and ray 2 is the emergent ray, as shown in the figure. Th… GSEB Board July 2018
• Depth of a completely filled well is 11 m and the refractive index of water is 1.33. If viewed normally from… GSEB Board March 2019
• In an optical fibre, the refractive index of the material of the core is that of the cladding. GSEB Board March 2020; GSEB Board July 2021
• The Earth takes 24 h to rotate once about its axis. The Sun will take time to shift by 1° when viewed from th… GSEB Board August 2020
• The refractive index of water is 4/3. What is the speed of light in water? GSEB Board August 2020
• The earth takes 24 h to rotate once about its axis. How much time does the sun take to shift by 2° when viewe… GSEB Board July 2021
• The refractive index of medium-3 with respect to medium-2, n₃₂, is equal to . GSEB Board March 2022
• The refractive index of medium-2 with respect to medium-1 is n₂₁. The angle of incidence for a ray is i and t… GSEB Board July 2022
• When the angle of incidence becomes equal to the critical angle, which one of the following choices would be… GSEB Board July 2022
• The earth takes 24 h to rotate once about the axis. How much time does the Sun take to shift by 2°, when view… GSEB Board March 2023
• The refractive index of a medium is 1.5. The speed of light in this medium is m s⁻¹. [Speed of light in vacuu… GSEB Board March 2023
• A small pin fixed on a table top is viewed from above from a distance of 100 cm. By what distance would the p… GSEB Board March 2023
• A small pin fixed on a table top is viewed from above from a distance of 50 cm. By what distance would the pi… GSEB Board July 2023
• The refractive index of glass is 1.53. What is the speed of light in glass? (Speed of light in vacuum is 3×10… GSEB Board July 2023