Physics ยท Science General
Optics and Light Properties
2,019 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
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Current density
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Tear drop
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Matrix area
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Point effect
A
Correct answer
Explanation
Lasers produce light that is monochromatic, meaning it consists of a single specific wavelength or color.
A
Correct answer
Explanation
IPL (Intense Pulsed Light) uses a broad spectrum of wavelengths, unlike lasers which use a single, focused wavelength.
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coherent
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collimated
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invisible
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polychomatic
D
Correct answer
Explanation
Unlike lasers, which are monochromatic and coherent, IPL is polychromatic, meaning it emits light at multiple wavelengths.
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dispersion
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pulse duration
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radiofrequency
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power density
D
Correct answer
Explanation
Power density is defined as the rate of energy (power) delivered to a specific area of tissue. It is often measured in watts per square centimeter.
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scatter
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photomodulation
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fluence
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optical intensity
C
Correct answer
Explanation
Fluence refers to the energy density of a pulsed laser, representing the amount of energy delivered per unit area (joules per square centimeter).
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Their medium
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their color
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intensity
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application
A
Correct answer
Explanation
Lasers are typically named after the medium used to create the light, such as CO2, Nd:YAG (neodymium-doped yttrium aluminum garnet), or Argon lasers.
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Collection
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absorption
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reflection
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transmission
A
Correct answer
Explanation
The four primary interactions of laser light with tissue are absorption, reflection, transmission, and scattering. Collection is not a recognized laser-tissue interaction.
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monochromatic light
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reflective light
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collimated light
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coherent light
D
Correct answer
Explanation
Coherent light refers to light waves that are in phase with each other, both spatially and temporally, which is a defining characteristic of laser light.
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color
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duration of exposure
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intensity
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texture
A
Correct answer
Explanation
The wavelength (color) of the laser determines which chromophore will absorb the light. Different chromophores have specific absorption spectra, meaning they react to specific wavelengths.
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travel at the speed of sound in the form of a wave
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travel at the speed of light to form a wave
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travel at the speed of sound to form a straight line
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travel at the speed of light to form a straight
B
Correct answer
Explanation
Photons are particles of light that travel at the speed of light and exhibit wave-like properties.
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elemental unit of light
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Built up amplification of laser light under external stimuli
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Tx using approp. wav, exposure time & pulse duration
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to stimulate or change cellular function
C
Correct answer
Explanation
Selective photothermolysis is the principle of using specific wavelengths, pulse durations, and fluences to target specific structures in the skin without damaging surrounding tissue.
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Laser beam has ability to reflect off of a shiny surface
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is the rate of energy being delivered
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It is the timing of light energy
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Deeper light transmits in the skin, more scatter is possible
D
Correct answer
Explanation
In laser-tissue interaction, scatter refers to the redirection of light as it travels through tissue. As light penetrates deeper, it encounters more structures, increasing the probability of scattering.
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light can be transmitted through tissue,fluid, & even glass
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The cells in the tissue are broken down
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light contacts tissue,the photon of light loses heat energy
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The absorption of light by chromophores
C
Correct answer
Explanation
Absorption occurs when light energy is taken up by tissue and converted into another form of energy, typically heat. This is the fundamental mechanism for how lasers affect target tissues.
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Incoherent light
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Monochromatic Light
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White light
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Coherent light
D
Correct answer
Explanation
Laser light is characterized by being coherent, meaning the light waves are in phase with each other. This is a defining property that distinguishes laser light from ordinary light sources.