Optical Instruments
Physics · 50 practice questions
General principles of microscopes, telescopes, projectors, cameras and the human eye; power of a lens; angular magnification; near and far points; sight defects and their corrections.
- Apply the principles of operation of optical instruments to solve problems and distinguish between the human eye and the camera.
- Calculate the power and angular magnification of a lens.
- Determine near and far points, and detect sight defects and their corrections.
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- Practice question 1
Presbyopia, an age-related sight defect in which the eye's lens loses flexibility, making close focusing difficult, is generally corrected using a
- A.diverging (concave) lens
- B.cylindrical lens
- C.plane mirror
- D.converging (convex) lens
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D. converging (convex) lens
A converging lens compensates for the eye's reduced ability to focus on nearby objects as it ages.
- Practice question 2
A wide-angle camera lens has a short focal length, allowing
- A.a much narrower field of view to be captured than a standard lens
- B.only extremely distant objects to be photographed clearly
- C.a wider field of view to be captured in a single photograph
- D.no image at all to be formed, since it lacks sufficient focusing power
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C. a wider field of view to be captured in a single photograph
This short focal length is exactly what lets a wide-angle lens capture a broader scene within a single frame.
- Practice question 3
Binoculars typically use a combination of lenses and prisms to magnify distant objects while
- A.always inverting the final image, just like a simple telescope
- B.eliminating the need for any external light source
- C.reducing the apparent size of distant objects
- D.keeping the final image upright, unlike a simple telescope which often inverts the image
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D. keeping the final image upright, unlike a simple telescope which often inverts the image
The internal prisms in binoculars correct the inversion that a simple lens telescope would otherwise produce.
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