JAMB and WAEC Physics questions: Optical instruments

22 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Optical instruments· JAMB

   Short sight is corrected with

   • Aa converging (convex) lens
   • Ba diverging (concave) lens
   • Ca plane glass
   • Da cylindrical mirror

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   Explanation and discussion

2. Question 2· Optical instruments· WAEC

   In a simple camera, the image is focused by

   • Achanging the aperture size
   • Bchanging the shutter speed
   • Cmoving the lens towards or away from the film
   • Dusing a mirror

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   Explanation and discussion

3. Question 3· Optical instruments· JAMB

   Long sight is corrected using

   • Aa prism
   • Ba diverging (concave) lens
   • Ca plane mirror
   • Da converging (convex) lens

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   Explanation and discussion

4. Question 4· Optical instruments· WAEC

   In a simple camera, the image is focused on the film by

   • Achanging the aperture
   • Bmoving the lens
   • Cchanging the shutter speed
   • Dmoving the film only by hand

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   Explanation and discussion

5. Question 5· Optical instruments· WAEC

   The image formed on the retina of the human eye is

   • Areal, inverted and diminished
   • Bvirtual and erect
   • Creal and erect
   • Dvirtual, inverted and magnified

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   Explanation and discussion

6. Question 6· Optical instruments· JAMB

   An object is 15 cm from a converging lens of focal length 10 cm. Find the image distance.

   • A25 cm
   • B6 cm
   • C30 cm
   • D5 cm

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7. Question 7· Optical instruments· WAEC

   Find the power of a diverging lens of focal length 25 cm.

   • A−0.04 D
   • B+4 D
   • C−4 D
   • D+25 D

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   Explanation and discussion

8. Question 8· Optical instruments· WAEC

   Short sight is corrected using a

   • Aconverging lens
   • Bdiverging lens
   • Cplane mirror
   • Dprism

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   Explanation and discussion

9. Question 9· Optical instruments· JAMB

   The image formed on the film or sensor of a camera is

   • Areal, upright and magnified
   • Bvirtual, upright and magnified
   • Creal, inverted and diminished
   • Dvirtual, inverted and diminished

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   Explanation and discussion

10. Question 10· Optical instruments· JAMB

    The final image seen through an astronomical telescope in normal adjustment is

    • Ainverted
    • Bupright and diminished
    • Creal
    • Dthe same size as the object

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    Explanation and discussion

11. Question 11· Optical instruments· WAEC

    An object is placed 20 cm from a converging lens of focal length 10 cm. The image is formed at a distance of

    • A20 cm
    • B10 cm
    • C6.7 cm
    • D30 cm

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12. Question 12· Optical instruments· JAMB

    The final image formed by a compound microscope is

    • Areal, upright and diminished
    • Bvirtual, inverted and magnified
    • Cvirtual, upright and diminished
    • Dreal, inverted and the same size

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    Explanation and discussion

13. Question 13· Optical instruments· JAMB

    A diverging lens has a focal length of 50 cm. Its power is

    • A+50 D
    • B+2 D
    • C−0.02 D
    • D−2 D

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14. Question 14· Optical instruments· JAMB

    In the camera, the part that controls the amount of light entering, like the iris of the eye, is the

    • Alens
    • Bfilm
    • Cdiaphragm (aperture)
    • Dshutter button

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15. Question 15· Optical instruments· WAEC

    Short-sightedness is corrected with a

    • Adiverging lens
    • Bconverging lens
    • Cplane mirror
    • Dprism

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    Explanation and discussion

16. Question 16· Optical instruments· WAEC

    A converging lens of focal length 5 cm is used as a magnifying glass with the final image at the near point, 25 cm away. Find the magnification.

    • A4
    • B5
    • C6
    • D25

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17. Question 17· Optical instruments· JAMB

    Find the power of a converging lens of focal length 25 cm.

    • A+0.25 D
    • B+25 D
    • C+4 D
    • D−4 D

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18. Question 18· Optical instruments· WAEC

    Prism binoculars use right-angled prisms mainly to

    • Aabsorb stray light
    • Bsplit light into colours
    • Cmagnify the image
    • Dinvert the image by total internal reflection

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19. Question 19· Optical instruments· WAEC

    The image formed on the screen by a slide projector is

    • Areal and diminished
    • Bvirtual and upright
    • Creal, inverted and magnified
    • Dvirtual and magnified

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20. Question 20· Optical instruments· JAMB

    Long sight (hypermetropia) is corrected with

    • Aa converging lens
    • Ba diverging lens
    • Ca plane mirror
    • Da prism

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    Explanation and discussion