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Refraction and Total Internal Reflection for GUJCET: 40 solved questions

Real GUJCET 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 2007 to 2025. No sign-in needed to read them.

What this topic asks

• Snell's law, slabs and apparent depth — 31 questions
• Total internal reflection and optical fibres — 9 questions

All 40 questions with solutions

• The wavelength of a monochromatic light in vacuum is λ. It travels from vacuum to a medium of absolute refrac… GUJCET 2007
• A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3 cm thick on it, how… GUJCET 2011
• Light is incident normally on the face AB of a prism as shown in the figure. A liquid of refractive index n i… GUJCET 2013
• The time taken by sunlight to reach the bottom of a tank of depth 4.5 m filled completely with water is ns. T… GUJCET 2014
• A ray of light passes from a medium A having refractive index 1.6 to the medium B having refractive index 1.5… GUJCET 2015
• Light waves travel from an optically rarer medium to an optically denser medium. Their velocity decreases bec… GUJCET 2015
• The velocity of e.m. waves of wavelength 5000 A in a medium of refractive index 2 is m/s. GUJCET 2016
• Time taken by the sunlight to pass through a slab of 4 cm and refractive index 1.5 is s. GUJCET 2017
• Time taken by the sunlight to pass through a slab of 4 cm and refractive index 1.5 is sec. GUJCET 2019
• The earth rotates on its axis and takes 24 hours to complete one revolution. How much time does the sun take,… GUJCET 2020
• A tank is filled with water to a height of 16 cm. Find the apparent depth of a needle lying at the bottom of… GUJCET 2021
• The refractive index of air with respect to vacuum is . GUJCET 2023
• The earth takes 24 h to rotate once about its axis. How much time does the Sun take to shift by 1 minute of a… GUJCET 2023
• Monochromatic light of wavelength 480 nm is incident from air on a glass surface. The refractive index of gla… GUJCET 2023
• The refractive index of glass is 1.6 then the speed of light in glass will be speed of light in vacuum is 3.0… GUJCET 2024
• The speed of light in a medium is 200 × 10⁸ cm/s. Refractive index of a medium is (c = 3 × 10⁸ m/s). GUJCET 2025
• 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
• A liquid of refractive index n fills a tank with a plane mirror on its bottom. A point object P sits on the l… RS Academy GUJCET booklet
• A ray of light is travelling from a denser medium to a rarer medium. For these media, the critical angle is C… RS Academy GUJCET booklet
• A tank contains water up to a height of 30 cm and above it oil up to another 30 cm height. A shift of cm in t… RS Academy GUJCET booklet
• Time taken by the sunlight to pass through a slab of thickness 4 mm and refractive index 1.5 is sec. RS Academy GUJCET booklet
• An air bubble in a glass slab of refractive index 1.5 is 5 cm deep when viewed from one face and 2 cm deep wh… RS Academy GUJCET booklet
• The refractive indices of four media, whose surfaces are all parallel, are n₁, n₂, n₃ and n₄ as shown in the… RS Academy GUJCET booklet