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1221
A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the the pinhole. If the image is 2.5cm high, the height of the building will be
  • A. 25m
  • B. 50m
  • C. 100m
  • D. 150m
View Answer & Discuss (5) JAMB 2012
1222

The magnification of an object 2cm tall when placed 10cm in front of a plane mirror is

  • A. 6.0
  • B. 1.0
  • C. 0.7
  • D. 0.6
View Answer & Discuss (15) JAMB 2012
1223
After reflection from the concave mirror, rays of light from the sun converges
  • A. at the radius of curvature
  • B. at the focus
  • C. beyond the radius of curvature
  • D. between the focus and radius of curvature
View Answer & Discuss (6) JAMB 2012
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1224
A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is
  • A. 3.33cm
  • B. 5.00cm
  • C. 6.67cm
  • D. 8.50cm
View Answer & Discuss (16) JAMB 2012
1225
I. Rays of light travel from a less dense medium to a denser medium. II. The Angle of incidence is greater than critical angle. III. Rays of light travel from a denser medium to a less dense medium. Which of the statements above are conditions for total internal reflection to occur?
  • A. I & II only
  • B. I & III only
  • C. II & III only
  • D. II only
View Answer & Discuss (1) JAMB 2012
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