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31

The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is? 

  • A. 0.33
  • B. 0.50
  • C. 0.67
  • D. 0.75
View Answer & Discuss (4) JAMB 2021
32

The power of the lens is +2.5D. What is the radius of the curvature?

  • A. 2.5 cm
  • B. 25.0 cm
  • C. 40.0 cm
  • D. 80.0 cm
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33

Which of the folowing statements about light travelling from one material medium to another is not correct?

  • A. The refracted angle is less than the incident angle if the speed is higher in the first material
  • A. Its wavelength does not change
  • B. It bends away from the normal if the speed is lower in the first material
  • D. Its frequency changes.
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34

The secondary pigments consist of?

  • A. blue, green, and violet
  • B. yellow, green, and magenta
  • C. magenta, yellow, and cyan
  • D. red, green, and blue
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35

A person standing waist-deep in a swimming pool appears to have short legs because of light?

  • A. diffraction
  • B. refraction
  • C. reflection
  • D. interference
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208