Physics · Science General
Optics and Light Properties
2,013 Questions
Optics and light properties focus on the behavior of light, including reflection, refraction, dispersion, and polarization. This topic also covers the wave nature of light, illumination, and the functioning of optical instruments like microscopes. Questions on these concepts are common in general science sections of SSC, Railways, and State exams.
Reflection and mirrorsRefraction and mediumsLight wave theoriesPolarization and intensity
Optics and Light Properties Questions
The operating voltage in coolidge tube is ${10}^{5}V$. The speed of X-Rays produced is ________ $m{s}^{-1}$
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$2\times { 10 }^{ 8 }\quad $
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${ 10 }^{ 6 }$
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${ 10 }^{ 5 }$
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$3\times { 10 }^{ 8 }$
D
Correct answer
Explanation
X-ray is an electromagnetic waves which moves with a speed equal to $3\times 10^8 \ m/s$
What is the term for the technique of using a snoot to create a narrow, concentrated beam of light?
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Diffusion
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Spotlighting
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Backlighting
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Sidelighting
B
Correct answer
Explanation
Spotlighting is a lighting technique that uses a snoot to create a narrow, concentrated beam of light with a defined shape.
What is the principle of spectrophotometry?
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The absorption of light by a sample is proportional to the concentration of the analyte.
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The emission of light by a sample is proportional to the concentration of the analyte.
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The scattering of light by a sample is proportional to the concentration of the analyte.
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The reflection of light by a sample is proportional to the concentration of the analyte.
A
Correct answer
Explanation
The principle of spectrophotometry is that the absorption of light by a sample is proportional to the concentration of the analyte.
What is the bending of light around massive objects called?
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Gravitational lensing
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Refraction
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Reflection
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Diffraction
A
Correct answer
Explanation
Gravitational lensing is the bending of light around massive objects, predicted by general relativity.
What is the basic principle behind spectroscopy?
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The interaction of light with matter
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The emission of light by excited atoms
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The absorption of light by molecules
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The reflection of light from surfaces
A
Correct answer
Explanation
Spectroscopy is based on the interaction of light with matter, which can result in the absorption, emission, or scattering of light.
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A graph showing the intensity of light as a function of wavelength
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A plot of the position of spectral lines
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A record of the colors of an object
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A map of the distribution of stars in a galaxy
A
Correct answer
Explanation
A spectrum is a graph that shows the intensity of light as a function of wavelength. It provides information about the composition and properties of the object emitting or absorbing the light.
What are absorption lines?
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Dark lines in a spectrum where light has been absorbed
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Bright lines in a spectrum where light has been emitted
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Lines that indicate the presence of certain elements in a celestial object
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Lines that show the motion of a celestial object
A
Correct answer
Explanation
Absorption lines are dark lines in a spectrum that correspond to wavelengths where light has been absorbed by atoms or molecules in the object being studied.
What is the Doppler effect?
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The change in frequency of light due to the motion of the source or observer
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The change in wavelength of light due to the motion of the source or observer
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The change in intensity of light due to the motion of the source or observer
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The change in color of light due to the motion of the source or observer
A
Correct answer
Explanation
The Doppler effect is the change in frequency of light due to the motion of the source or observer. It is used in astronomy to study the motion of celestial objects.
What is the fundamental principle behind interferometry?
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Combining the light waves from multiple telescopes
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Increasing the diameter of a single telescope
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Reducing the wavelength of the observed light
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Eliminating atmospheric turbulence
A
Correct answer
Explanation
Interferometry works by combining the light waves collected by multiple telescopes, allowing astronomers to synthesize a larger aperture and achieve finer resolution.
What is the fundamental principle behind optical interferometry?
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Combining the light waves from multiple telescopes
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Increasing the diameter of a single telescope
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Reducing the wavelength of the observed light
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Eliminating atmospheric turbulence
A
Correct answer
Explanation
Optical interferometry works by combining the light waves collected by multiple telescopes, allowing astronomers to synthesize a larger aperture and achieve finer resolution.
What is the term used to describe the ability to perceive light but not form or detail?
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Visual acuity
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Light perception
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Color vision
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Contrast sensitivity
B
Correct answer
Explanation
Light perception refers to the ability to detect the presence or absence of light, but without the ability to distinguish shapes or details.
What is the term used to describe the ability to see objects clearly at different levels of brightness?
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Visual acuity
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Contrast sensitivity
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Luminance sensitivity
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Depth perception
C
Correct answer
Explanation
Luminance sensitivity refers to the ability to see objects clearly at different levels of brightness, allowing us to perceive objects in varying lighting conditions.
What is the effect of coma aberration on the appearance of point sources of light?
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They appear as elongated streaks
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They appear as fuzzy disks
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They appear as double images
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They appear as colored fringes
A
Correct answer
Explanation
Coma aberration causes point sources of light to appear as elongated streaks or comet-like shapes. This is due to the asymmetrical distribution of light rays around the optical axis, resulting in a distorted image.
What is the term used to describe the color temperature of a light source?
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Kelvin
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Lumens
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Watts
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Candela
A
Correct answer
Explanation
Color temperature is measured in Kelvin (K) and indicates the perceived warmth or coolness of a light source.
What is the term used to describe the amount of light emitted by a light source?
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Luminance
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Illuminance
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Luminous flux
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Luminous intensity
C
Correct answer
Explanation
Luminous flux is the term used to describe the amount of light emitted by a light source, measured in lumens.