The principle on which lenses work is A) refraction. B) polarization. C) dispers

Question

The principle on which lenses work is A) refraction. B) polarization. C) dispersion. D) total internal reflection lenses that are thicker at the center A) spread out light rays. B) bend light rays to a point beyond the lens. C) have no effect on light rays. D) reflect all light rays back. The images formed by concave lenses A) are always real. B) are always virtual. C) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length. D) could be real or virtual, but always real when the object is placed at the focal point. The critical angle for a beam of light passing from water into air is 48.8 degree. This means that all light rays with an angle of incidence greater than this angle will be A) absorbed. B) totally reflected. C) partially reflected and partially transmitted. D) totally transmitted.

Explanation / Answer

7. A) refraction

8.C) have no effect on light rays

9. B) always virtual

10. B) totally reflected

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