TEST OF PRACTICAL KNOWLEDGE QUESTION You are provided with an illuminated object, converging lens, screen, metre rule, and other necessary materials. Measur...

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TEST OF PRACTICAL KNOWLEDGE QUESTION


You are provided with an illuminated object, converging lens, screen, metre rule, and other necessary materials.

  • Measure and record the size a\(_{o}\) of the illuminated object.
  • Place the object O and the screen S on Opposite sides of the converging lens L.
  • Set the distance between the object and the lens U = 30cm.
  • Adjust the screen until a sharp image of the illuminated object is obtained on the screen.
  •  Measure and record the size a of the image.
  • Evaluate m = \(\frac{a}{a_{0}}\), and m\(^{-1}\)
  • Repeat the procedure for four other values of U=35cm, 40cm, 45cm and 50cm respectively.
  • Tabulate your readings.
  • Plot a graph with m\(^{-1}\) on the vertical axis and U on the horizontal axis.
  • Determine the slope, s, of the graph and intercept, C, on the vertical axis.
  • Determine the value of U for which m\(^{-1}\)=0.
  • State two precautions taken to obtain accurate results.

(b)i. Using your graph, determine the value of m for which U= 37cm.

ii. Sketch a diagram to illustrate how a converging lens may be used to produce a real diminished image of an object.

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