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2661
When an object is placed at the principal focus of a concave mirror, the location of the image formed is
  • A. between principal focus and pole
  • B. between principal focus and centre of curvature
  • C. at infinity
  • D. at centre of curvature
View Answer & Discuss (1) WAEC 2010
2662

From the diagram, the correct equation for the refractive index n of the medium is

  • A. n = tan i
  • B. n = \(\frac{sin i}{sin 90^o}\)
  • C. n = \(\frac{sin i}{cos (90^o - i)}\)
  • D. n = sin 90oC
View Answer & Discuss (5) WAEC 2010
2663
A ray of light travels from air to water. The refeactive index of water is given by the expression
  • A. \(\frac{\text{velocity in water}}{\text{velocity in air}}\)
  • B. \(\frac{\text{sine of angle of refraction}}{\text{sine of angle of incidence}}\)
  • C. \(\frac{\text{apparent depth}}{\text{real depth }}\)
  • D. \(\frac{\text{wavelength in air}}{\text{wavelength in water}}\)
View Answer & Discuss WAEC 2010
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2664
A lens that is thinner at the middle and thicher at the edges is
  • A. diverging
  • B. converging
  • C. plano-convex
  • D. converging meniscus
View Answer & Discuss (1) WAEC 2010
2665
Which of the following electromagnetic wave has the longest wavelength?
  • A. radio-waves
  • B. gamma rays
  • C. infrared waves
  • D. ultraviolet rays
View Answer & Discuss (5) WAEC 2010
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