A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes:
Correct answer: B. in front of the retina
- A. behind the retina
- B. in front of the retina
- C. on the retina
- D. on the blind spot
Explanation
Concave lenses diverge incoming rays and are used to correct myopia, in which the eye focuses distant objects before they reach the retina. Therefore, without glasses the image forms in front of the retina. Students may choose behind the retina by confusing myopia with hypermetropia, which is corrected with a convex lens.
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About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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