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

Multiple choice

Term refers to the energy of a pulsed laser light

  1. scatter

  2. photomodulation

  3. fluence

  4. optical intensity
Reveal answer Fill a bubble to check yourself
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).

Multiple choice

what are lasers usually named in reference to

  1. Their medium

  2. their color

  3. intensity

  4. application
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

What is NOT one of the four effect of laser

  1. Collection

  2. absorption

  3. reflection

  4. transmission
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

term that refers to the light energy that is " in phase"

  1. monochromatic light

  2. reflective light

  3. collimated light

  4. coherent light
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

what do photons do?

  1. travel at the speed of sound in the form of a wave

  2. travel at the speed of light to form a wave

  3. travel at the speed of sound to form a straight line

  4. travel at the speed of light to form a straight
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photons are particles of light that travel at the speed of light and exhibit wave-like properties.

Multiple choice

What is selective photothermolysis?

  1. elemental unit of light

  2. Built up amplification of laser light under external stimuli

  3. Tx using approp. wav, exposure time & pulse duration

  4. to stimulate or change cellular function
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

What does the term scatter mean in regards to light?

  1. Laser beam has ability to reflect off of a shiny surface

  2. is the rate of energy being delivered

  3. It is the timing of light energy

  4. Deeper light transmits in the skin, more scatter is possible
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

What does the term absorption mean in regards laser light and tissue?

  1. light can be transmitted through tissue,fluid, & even glass

  2. The cells in the tissue are broken down

  3. light contacts tissue,the photon of light loses heat energy

  4. The absorption of light by chromophores
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

Laser light is referred to as:

  1. Incoherent light

  2. Monochromatic Light

  3. White light

  4. Coherent light
Reveal answer Fill a bubble to check yourself
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.

Multiple choice

Coherent light is ...

  1. Light energy that is not "in phase"

  2. Light energy that is "in phase"

  3. Light energy that is "out of sync"

  4. White light that is "out of phase"
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coherent light consists of waves that are in phase, meaning their peaks and troughs align perfectly. This spatial and temporal alignment is what allows laser beams to remain focused over long distances.

Multiple choice

What does LASER stand for?

  1. Light Amplification by Stimulated Emission of Radio-waves

  2. Light Augmented by Stimulated Emission of Radiation

  3. Light Augmented by Stimulated Emission of Radio-waves

  4. Light Amplification by Stimulated Emission of Radiation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

LASER is an acronym for Light Amplification by Stimulated Emission of Radiation. This describes the physical process by which the laser beam is generated.

Multiple choice evs option d: astrophysics moon the moon's path in the sky the moon

sky appears blue because of 

  1. Total Internal

  2. Scattering

  3. Refraction

  4. Total internal reflection
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sky appears blue because of Scattering.Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.


Therefore, B is correct option.