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 reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Which of the following is the main reason of Opacity of light waves.

  1. reflection

  2. absorption

  3. refraction

  4. diffusion

  5. transmission
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Objects are visible to the eye when light strikes the surface and reflects back itself into the eye. Opaque objects show this phenomenon.

However in the transparent objects, the incident light on their surface gets transmitted, hence does not reflect back to eye and appear transparent.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

A ray of light striking a plane mirror at an angle of 35 degrees with the normal.

Find out the angle of reflection with normal.

  1. 35 degrees.

  2. 55 degrees.

  3. 10 degrees

  4. 90 degrees

  5. 125 degrees
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Angle of incidence    $i = 35$ degrees

According to Snell's law of reflection, the angle of incidence is equal to the angle of reflection.
$\implies$ Angle of reflection      $r = i = 35$  degrees

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

When a light ray falls on a perfectly reflective mirror at an angle. Identify which of the following statement is true about the ray?

  1. The frequency of the light ray changes

  2. The wavelength of the light ray changes

  3. The velocity of the light ray changes

  4. The period of the light ray changes

  5. The direction of motion of the light ray changes
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

When a light ray falls on a perfectly reflective mirror at some angle, then only the direction of the light rays changes such that the angle of incidence is equal to the angle of reflection but the frequency, wavelength, time period and the velocity of the light remain constant.

Thus option E is correct.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

In which of the following conditions diffuse reflection takes place?

  1. When a parallel beam of light is reflected by a plane mirror.

  2. When a parallel beam of light is reflected by a highly polished metal surface.

  3. When a parallel beam of light is reflected by a paper sheet.

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diffuse reflection occurs when light hits a rough or irregular surface, causing it to scatter in many directions. A paper sheet has a microscopically rough surface compared to mirrors or polished metal, which produce specular reflection.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

What is the correct definition of reflectance?

  1. Difference between amount of light absorbed by the surface and amount of light reflected.

  2. The amount of light reflected by a surface is known as reflectance.

  3. The ratio of the amount of the light reflected from a surface to the amount of light falling on the surface is called reflectance.

  4. The ratio of amount of light falling on a surface to the amount of light reflected on the surface is called reflectance.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to definition, ratio of the amount of light reflected from a surface to the amount of light falling on the surface is called reflectance.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

The angle formed between the incident ray and the normal is called _____________

  1. angle of incidence

  2. angle of reflection

  3. angle of refraction

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

Angle of incidence is the angle between incident ray and normal to the reflecting surface at the point of incidence.


Answer-(A).

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

When light rays travelling from one medium fall at the surface of another medium ............ the light rays returns back to the same medium.

  1. All of

  2. Part of

  3. None of

  4. Can't be determined
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When light rays traveling from one medium fall at the surface of another medium part of the light rays returns back to the same medium.
For example in window mirror we can see our image and we can also see outside objects because of both reflection and refraction of light.

Multiple choice geography the earth and the graticule general idea about earth space around the earth is the earth round?

Rainbow is produced when sunlight falls on drops of rains. Which of the following physical phenomena are responsible for this?
(I). Dispersion
(II). Refraction
(III). Internal Reflection.

  1. II and III only

  2. I and II only

  3. I, II and III

  4. I and III only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The formation of a rainbow involves a series of physical phenomena- reflection, refraction, dispersion and total internal reflection. The occurrence of each of these is due to the interaction of light with air and water and the boundaries between them.

Multiple choice physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

Substances that allow light to pass through them are called

  1. Transparent

  2. Translucent

  3. Opaque

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

Transparent objects are those objects that allow large quantities of light to pass through them. 

Air, water and shiny glass are all examples of transparent materials.

Multiple choice physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

Transparent objects.

  1. do not let light to pass through them

  2. allow light to pass through them

  3. absorb some amount of light and allow the remaining to pass through them

  4. reflect all the amount of light falling on them
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transparent objects allow light to pass through them. These are objects having the property of transmitting light without any appreciable scattering so that the bodies lying beyond it are seen clearly.

Multiple choice physics light and shadow substances which allow light to pass through and those which do not transparent, opaque and translucent objects shadows

A substance through which light can pass completely is called a/an

  1. transparent body

  2. translucent body

  3. opaque body

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A substance is said to be transparent if light can pass easily through it. Example: glass

A substance is said to be translucent if light passes only partially through it. Example: Butter paper
A substance is said to be opaque if light does not pass through it. so, we can't see through these objects. Example: paper