The focal length of a plane mirror is:
Correct answer: A. Infinity
- A. Infinity
- B. Zero
- C. Equal to radius of curvature
- D. None
Explanation
A plane mirror has no curvature (R = ∞), hence focal length f = R/2 = ∞.
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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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