A Circle has a number of tangents equal to _________?
Correct answer: D. Infinite
- A. 0
- B. 1
- C. 2
- D. Infinite
Explanation
At every point on a circle there is one tangent, and a circle contains infinitely many points. Hence it has infinitely many tangents, each perpendicular to the radius at its point of contact. Students may choose two by confusing tangents from an external point with tangents to the circle as a whole.
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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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