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1696
A dentist obtains a linear magnification of 4 of a hole in a tooth by placing a concave mirror at a distance, of 2.0cm from the tooth. The radius of Curvature of the mirror is
  • A. 5.3cm
  • B. 3.2cm
  • C. 2.7cm
  • D. 1.6cm
View Answer & Discuss (22) JAMB 1986
1697
What is the effect of the increase in the size of the hole of a pin-hole camera on the image? it
  • A. gives a blurred image
  • B. corrects for chromatic aberration
  • C. magnifies the image
  • D. brings the image into a sharper focus
View Answer & Discuss (4) JAMB 1986
1698

A pencil is placed vertically between a concave mirror and its focal point. The image of the pencil in the mirror will be

  • A. real, inverted and diminished
  • B. virtual, inverted and enlarged
  • C. real, erect and enlarged
  • D. virtual, erect and enlarged
View Answer & Discuss (5) JAMB 1986
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1699

A wave of frequency 10Hz forms a stationary wave pattern in a medium where the velocity is 20cms-1. The distance between adjacent nodes is

  • A. 1.0cm
  • B. 1.5cm
  • C. 2.0cm
  • D. 5.0cm
View Answer & Discuss (11) JAMB 1986
1700
Which of the following is true of the loudness of sound? It
  • A. depends on the square of the amplitude of the vibrating body
  • B. is proportional to the distance of the observer from the source of the sound
  • C. is greatest in vacuum
  • D. is dependent in vacuum
View Answer & Discuss (2) JAMB 1986
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