A three-dimensional image is obtained by________________?
Correct answer: B. Scanning electron microscope
- A. Electron microscope
- B. Scanning electron microscope
- C. Magnetic imaging
- D. None of the aboveElectron Microscopes
Explanation
A scanning electron microscope scans a focused electron beam over a specimen and detects secondary electrons from its surface, producing a detailed three-dimensional-looking surface image. A conventional transmission electron microscope mainly gives a two-dimensional projection through a thin specimen. The likely mistake is choosing electron microscope generally without identifying the scanning type.
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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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