Light & Optics MCQs with Answers

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A convex lens is used to correct long-sightedness (hypermetropia) because it converges light rays to focus them properly on the retina.

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When a wave travels from a denser medium to a rarer medium, there is no phase change upon reflection or transmission at the boundary.

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The energy of photons in the Lyman series is highest among all hydrogen spectral series.

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In Compton scattering, the largest change in wavelength occurs when the photon is scattered through 180° (backscattering).

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Photons emitted in inner shell transitions are called Characteristic X-rays.

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Gamma rays are the most dangerous among the given options because they have the highest penetrating power and can pass through the human body, causing severe cellular and DNA damage.

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Glass does not show anisotropy because it is an amorphous solid with uniform properties in all directions.

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The reverse process of X-ray production is the Photoelectric effect, where incident photons eject electrons from a material.

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Electromagnetic radiation with the maximum wavelength is radio waves.

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Gamma rays have the highest energy among all electromagnetic waves because they have the shortest wavelength and highest frequency.