When a monochromatic light travels from a glass into the air, then _.
Correct answer: B. Its frequency stays the same but its wavelength increases
- A. Its frequency and wavelength both stay the same
- B. Its frequency stays the same but its wavelength increases
- C. Its frequency increases but its wavelength stays the same
- D. Its frequency decreases and wavelength increases
Explanation
When monochromatic (single wavelength) light travels from a glass into the air, its frequency remains the same but its wavelength increases. This is due to a property of light waves called refraction, which occurs when light enters a medium with a different refractive index than the one it was traveling in previously. The speed of light changes as it passes through a medium with a different refractive index, causing the direction of the light wave to bend and its wavelength to change while its frequency remains constant.
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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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