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26

An object is placed 36cm from a converging lens of focal length 24cm.If a real image which is 4cm high is formed, Calculate the height of the object.

  • A. 2.0cm
  • B. 4.0cm
  • C. 6.0cm
  • D. 8.0cm
  • E. 10.0cm
View Answer & Discuss (5) WAEC 1988
27
The ability of the eye to focus objects at different distances is called
  • A. power
  • B. accommodation
  • C. normal vision
  • D. persistence of vision
  • E. long sight
View Answer & Discuss WAEC 1988
28

The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?

  • A. refraction
  • B. reflection
  • C. diffraction
  • D. interference
  • E. dispersion
View Answer & Discuss (11) WAEC 1988
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29
A source of sounds produces waves in air of wavelength1.65m. If the speed of sound in air is 330ms-1 the period of vibration in seconds is
  • A. 200
  • B. 2.0
  • C. 0.5
  • D. 0.02
  • E. 0.005
View Answer & Discuss (3) WAEC 1988
30
Which of the following statement s is/are not correct about a standing wave? I. It is formed by the superimposition of two progressive waves traveling in the same direction II. All points on the wave are vibrating with maximum displacement III. It is formed by the superimposition of two progressive waves of different amplitudes traveling in opposite directions
  • A. I only
  • B. II only
  • C. I and II only
  • D. II and III only
  • E. I,II and III
View Answer & Discuss (12) WAEC 1988
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