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WAEC Physics questions: Light: refraction

12 questions with answers and explanations. Tap an option to check yourself.

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All topicsCapacitors · 10Change of state · 11Conduction of electricity through liquids and gases · 9Current electricity · 15Dispersion of light and colours · 10Elasticity · 11Electric cells · 9Electrical energy and power · 11Electromagnetic induction · 11Electrostatics · 9Elementary modern physics · 11Equilibrium of forces · 12Friction · 9Gas laws · 11Gravitational field · 11Heat transfer · 10Introductory electronics · 9Light: reflection · 11Light: refraction · 12Liquids at rest · 11Magnets and magnetic fields · 9Measurements and units · 12Motion · 22Optical instruments · 10Pressure · 11Quantity of heat · 11Scalars and vectors · 11Simple a.c. circuits · 9Simple machines · 11Sound waves · 11Temperature and its measurement · 10Thermal expansion · 11Waves · 14Work, energy and power · 14

  1. Question 1· Light: refraction· WAEC

    The critical angle for glass of refractive index 1.5 is about

    Explanation and discussion

  2. Question 2· Light: refraction· WAEC

    A ray of light passing from air into glass bends

    Explanation and discussion

  3. Question 3· Light: refraction· WAEC

    A coin at the bottom of water 4 m deep appears 3 m deep. The refractive index of the water is

    Explanation and discussion

  4. Question 4· Light: refraction· WAEC

    A swimming pool looks shallower than it really is because of

    Explanation and discussion

  5. Question 5· Light: refraction· WAEC

    Light passes from air into glass of refractive index 1.5. If the angle of incidence is 30°, the sine of the angle of refraction is

    Explanation and discussion

  6. Question 6· Light: refraction· WAEC

    The power of a lens of focal length 25 cm is

    Explanation and discussion

  7. Question 7· Light: refraction· WAEC

    The bending of light as it passes from one medium into another is

    Explanation and discussion

  8. Question 8· Light: refraction· WAEC

    A converging lens of focal length 10 cm forms an image of an object placed 15 cm from it at

    Explanation and discussion

  9. Question 9· Light: refraction· WAEC

    Find the critical angle for water of refractive index 4/3.

    Explanation and discussion

  10. Question 10· Light: refraction· WAEC

    A coin lies at the bottom of water 12 cm deep. If the refractive index of water is 4/3, how deep does the coin appear?

    Explanation and discussion

  11. Question 11· Light: refraction· WAEC

    Light passes from air into glass of refractive index 1.5 at an angle of incidence of 30°. Find the angle of refraction.

    Explanation and discussion

  12. Question 12· Light: refraction· WAEC

    Water has a refractive index of 1.33. Find the speed of light in water. (c = 3 × 10⁸ m/s)

    Explanation and discussion

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