Physics · 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

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

Dispersion of white light into its constituent colours occurs during 

  1. Reflection at a plane mirror

  2. Reflection at a concave mirror

  3. Internal reflection inside a spherical drop of water

  4. Refraction at the boundary of a transparent medium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Upon entry of white light at the first boundary of a triangular prism, there will be a slight separation of the white light into the component colours of the spectrum. Upon exiting the triangular prism at the second boundary, the separation becomes even greater and ROYGBIV is observed in its splendor. Hence, Dispersion of white light into its constituent colours occurs during refraction at the boundary of a transparent medium.

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

Dispersion of white light into its constituent colours occurs during

  1. reflection at a plane mirror

  2. reflection at a concave mirror.

  3. internal reflection inside a spherical drop of water

  4. refraction at the boundary of a transparent medium.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Upon entry of white light at the first boundary of a triangular prism, there will be a slight separation of the white light into the component colours of the spectrum. Upon exiting the triangular prism at the second boundary, the separation becomes even greater and ROYGBIV is observed in its splendor. Hence, Dispersion of white light into its constituent colours occurs during refraction at the boundary of a transparent medium.

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

Which of the following colours of light undergoes the least deviation while passing through a glass prism ?

  1. Red

  2. Blue

  3. Yellow

  4. Green
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red goes through least deviation because it has highest speed among VIBGYOR.

We know,            $\nu\times \lambda=c$
   Frequency is a constant quantity.
also, 
                           $\mu=\dfrac{velocity\ of\ light\ in\ vacuum}{velocity\ of\ light\ in\ a\ medium}$
.

   so refractive index will be very less for red color and hence show least deviation.


Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

The light which refracts most while passing through a prism is

  1. Red

  2. Violet

  3. Indigo

  4. Yellow
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Violet is having shortest wavelength among VIBGYOR. 

We know,            $\nu\times \lambda=c$
   Frequency is a constant quantity.
also, 
                           $\mu=\dfrac{velocity\ of\ light\ in\ vacuum}{velocity\ of\ light\ in\ a\ medium}$
  so, refractive index property for violet will be maximum and it will refract the most.

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

Which of the following colour of light undergoes the maximum deviation while passing a glass prism ?

  1. Red

  2. Blue

  3. Violet

  4. Green
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Violet undergoes maximum deviation while passing through a prism because it has least wavelength , as we know,

            We know,            $\nu\times \lambda=c$
   Frequency is a constant quantity.
also, 
                           $\mu=\dfrac{velocity\ of\ light\ in\ vacuum}{velocity\ of\ light\ in\ a\ medium}$
  so, refractive index property for violet will be maximum and it will refract the most. and will have the greatest deviation.

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

When light passes through a medium that consists of scatters such as water vapour, dust particles, which colour of light experiences highest scattering?

  1. $Violet$
  2. $Red$
  3. $Yellow$
  4. $Orange$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Violet have least wavelength among the visible light spectra.

       According to Rayleigh Criterion,  Scattering probability is proportional to $\dfrac{1}{\lambda^4}$.
So, violet light will be scattered the most.

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

When light enters a dispersive medium, light wave of different wavelength travels with different velocities.

  1. Yes

  2. No

  3. Sometimes

  4. When medium is a fibre
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, speed becomes different for different wavelengths in a particular medium. In a given dispersive medium the speed for different colours is different and due to this phenomenon we can see the spectrum of VIBGYOR.

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

What is known as dispersion of light?

  1. The phenomenon due to which a polychromatic light, like sunlight, splits into its component colours, when passed through a transparent medium

  2. The phenomenon due to which a polychromatic light, like sunlight, splits into its component colours, when passed through a opaque medium

  3. The phenomenon due to which a polychromatic light, like sunlight, splits into its component colours, when passed through a translucent medium

  4. The phenomenon due to which a polychromatic light, like sunlight, do not splits into its component colours, when passed through a transparent medium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When white light pass through a glass prism the white light get scatter in so many colours of light according to it's frequency and the lights are (VIBGYOR) ,this phenomena of scattering of light is called
dispersion of light.

Image result for What is known as dispersion of light?

Multiple choice physics spectra sunlight - white and coloured sunlight - combination of 7 lights fibre optics basics

Due to which property of colours they appear differently though the sunlight is passed through only one medium?

  1. Due to different refractive index with respect to medium

  2. Due to different frequencies with respect to medium

  3. Due to different amplitudes with respect to medium

  4. Due to different colour with respect to medium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Refraction is a phenomenon that happens when a beam of white light passes through the interface between air and a denser medium, such as glass or water. Light travels more slowly in a denser medium, so it changes direction – or refracts – when it passes through the interface. White light is a mixture of all the wavelengths of light, and each wavelength refracts at a slightly different angle. Therefore, when the beam emerges from the denser medium, it has been split into its component wavelengths. The ones you can see form the familiar rainbow

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Ctenophores exhibit

  1. Radial symmetry

  2. Asymmetry

  3. Biradial symmetry

  4. Bilateral symmetry
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Ctenophora are also known as comb jellies. This is a phylum of animals that lives in marine waters. 
  • Many species in this group have the body which is biradially symmetrical. The main axis is oral to aboral (from the mouth to the opposite end). This gives the bilateral form. 
  • The tentacles are present around the mouth. These tentacles radiate outwards. This gives the radial form of symmetry. Thus, the type of symmetry is known as biradial symmetry. 

Therefore, the correct answer is option C.

Multiple choice geography precipitation elements of weather and climate :rainfall and air pressure forms of precipitation moisture in atmosphere

The Stevenson's Screen is painted white to reflect ____________.

  1. sound

  2. sun's rays

  3. light

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stevenson's Screen is used to shield meteorological instruments from precipitation and direct external radiations, such as heat. The screen is louvered to allow air to circulate around the instruments. Additionally, the screen is painted white to reflect the sun’s direct rays. This facilitates meteorological instruments such as thermometers and thermographs to measure temperatures in a standardized environment.

The Stevenson's Screen forms part of all-weather stations and was designed by Thomas Stevenson.

Multiple choice physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

What is the advantage of choosing the wavelength of light as a standard of length?

  1. Travels fast

  2. Speed independent of location and temperature

  3. No medium to travel

  4. No advantage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Advantage :

1) It is easy available and invariable

2) It is well defined and does not change with locations, temperature, time, pressure etc