Post-UTME Physics 2016 Objective — Question 9
Question 9 of 20 from the Post-UTME Screening (Post-UTME) Physics 2016 Objective paper, with the correct answer and a full explanation.
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Diagram: light rays pass through an aperture past an opaque globe (with measurements 6cm, 4cm, 2cm) towards a screen at distance x. From the diagram, what is the distance x if there is no shadow of the globe on the screen?
- A. 4.0cm
- B. 6.0cm
- C. 3.0cmCorrect
- D. 5.0cm
Explanation
Using similar triangles based on the geometry of the light source, aperture, and globe (so that the penumbra regions from each edge of the source exactly meet with no umbra reaching the screen), the distance works out to approximately 3.0cm. (Note: precise figure dimensions were only partially legible in the scan.)
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