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Friday, 22 May 2026
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Physics Past Questions and Answers

Jamb 1994 Physics Questions

Question 26:
To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to
  • A The focal length
  • B Two times the focal length
  • C The distance of the image
  • D Two times the radius of curvature
View Answer & Explanation
Question 27:
Light of frequency 6.0 x 1014 Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass
  • A 4.0 x 10<sup style='font-size: smaller;'>14</sup>Hz
  • B 6.0 x 10<sup style='font-size: smaller;'>14</sup>Hz
  • C 7.5 x 10<sup style='font-size: smaller;'>14</sup>Hz
  • D 9.0 x 10<sup style='font-size: smaller;'>14</sup>Hz
View Answer & Explanation
Question 28:
An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?
  • A 5cm
  • B 10cm
  • C 30cm
  • D 40cm
View Answer & Explanation
Question 29:
An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5.
  • A 1.0cm
  • B 1.5cm
  • C 2.0cm
  • D 2.5cm
View Answer & Explanation
Question 30:
In a projection lantern of focal length f, the object distance u, is such that
  • A U > 2f > f
  • B U < f < 2f
  • C U = f < 2f
  • D F < u < 2f
View Answer & Explanation