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 communication system commonly used terms in electronic communication system elements of communication system electromagnetic waves and communication system

The waves emitted by a radio transmitter are 

  1. linearly polarised

  2. unpolarised

  3. monochromatic

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

Waves emitted by a radio transmitter are usually linearly polarized. The vertical antennas that are used for radio broadcasting emit waves that, in a horizontal plane around the antenna, are polarized in the vertical direction parallel to the antenna.

Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

You are able to see in shaded areas, such as under a tree, because light has undergone:

  1. refraction

  2. incident bending

  3. a change in speed

  4. diffused reflection
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a diffused or irregular reflection, parallel rays of light, after striking a rough and curved surface, get reflected irregularly.

Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

Which surfaces are said to be smooth?

  1. As long as the irregularities of surfaces are small as compared to the wavelength of the incident light.

  2. As long as surface irregularities are large compared to the wavelength of the incident light.

  3. As long as surface smoothness are small as compared to wavelength of reflected light

  4. As long as the surface irregularities are large as compared to the wavelength of reflected light.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A surface behaves as a smooth surface as long as the surface irregularities are small compared with the wavelength of the incident light.

Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

The change in reflected wave, when light wave suffers reflection at the interface from air to glass is?

  1. $0$
  2. $\dfrac{\pi}{2}$
  3. $\pi$
  4. $2\pi$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to π
Hence the option C is the right answer
Multiple choice physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

The reflection taking place from the walls of a building is called:

  1. regular reflection

  2. diffused reflection

  3. multiple reflection

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

The reflection taking place from the walls of a building is called diffused reflection.
In diffused reflection, the reflected rays are not parallel to each other. This kind of reflection occurs from a coarse surface. Walls of a building being coarse surfaces, give rise to diffused reflections.

Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

Consider telecommunication through optical fibres. Which of the following statement is not true?

  1. Optical fibres may have homogenous core with a suitable cladding.

  2. Optical fibres can be graded refractive index.

  3. Optical fibres are subject to electromagnetic interference from outside.

  4. Optical fibres have extremely low transmission loss.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Optical fibres are not subjected to electro-magnetic interference from outside.

Multiple choice physics physical world introduction to science contribution of physics in technology and society physics in relation to other sciences

White colour of the cloud is due to ___________________.

  1. reflection of seven colors of light

  2. refraction of seven colors of light

  3. scattering of seven colors of light

  4. absorption of seven colors of light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Large dust particles and water droplets scatter all wavelength almost equally. Hence clouds appears white.

Multiple choice newton's colour disc light and the formation of shadows physics

Monochromatic light is that light in which :

  1. yellow and red light is present

  2. various wavelengths are present

  3. red and violet light is present

  4. single wavelength is present
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chromatic is something related to color. So "monochromatic" means a single color, which means light of single wavelength. 
Hence correct answer is D.

Multiple choice newton's colour disc light and the formation of shadows physics

Which of the following sources of light is different from others ?

  1. Sunlight

  2. White light

  3. Light from a bulb

  4. Sodium light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Answer:-$ D option

Sunlight,white light , light from bulb when passed from prism will split into its constituent colours,i.e. spectrum will be seen.
But when sodium light is passed it will not show colour band since it is a monochromatic light(light having only one constituent colour). 

Multiple choice newton's colour disc light and the formation of shadows physics

____ is an example of a light having a spectrum of 7 colors.

  1. Sunlight

  2. White light

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Isaac Newton was the first person to split sunlight into seven colors using a glass prism. When he tried to split the band of colors further using a second prism placed in the inverted position as compared to that of the first, he observed that the emergent ray was white colored. This gave him an idea that sunlight is made up of 7 colors and any other light that gives a spectrum similar to that of sunlight is often referred to as white light.

Multiple choice newton's colour disc light and the formation of shadows physics

If a newton's colour disc composed of seven colours is rotated at high speed, it appears as 

  1. Seven coloured disc rotating

  2. Few colours merge and only three dominant colours are visible

  3. Colours mix and it appears white

  4. Colours mix giving a sparkling effect
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When newton's colour disc is rotated at high speed it appears white.

Multiple choice newton's colour disc light and the formation of shadows physics

Which of the following most appropriately defines a spectrum?

  1. The band of seven colours is known as spectrum

  2. The process of splitting of white light into seven colours is known as spectrum

  3. The different wavelength of light are termed as spectrum

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Visible range consists of seven different colours i.e, VIBGYOR. The band of these seven colours is known as spectrum.

Multiple choice newton's colour disc light and the formation of shadows physics

Due to which phenomena the combination of red, green and blue forms the same white colour

  1. Due to persistence of vision

  2. Due to reflection

  3. Due to refraction

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

Due to persistence of vision the combination of red, green and blue forms the same white color.