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 beam of light ray and beam ray optics

The shape of spot light produced when bright sunshine passes perpendicular through a hole of very small size, is:

  1. Square because hole is square

  2. Round because it is an image of the sun

  3. Round with a small pinumbra around it

  4. Square with a small pinumbra
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The spots are often oval, rather than round. That's because the sunlight is hitting the ground at an angle and the round sun images are stretching out to make ovals.
  • It's perpendicular to the sun's rays, and the spots should become round. 
  •  Hence option B is the right answer

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A light is said to be divergent when :

  1. all the rays travel parallel to each other

  2. all the rays spread from a point source of light

  3. all the rays converge together to a single point

  4. it travels in an irregular pattern
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the rays of light starting from a point travel in different directions, then the collection of such rays is termed as a divergent beam of light.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A light is said to be convergent when :

  1. all the rays travel parallel to each other

  2. all the rays spread form a point source of light

  3. all the rays converge towards a single point

  4. it travels in an irregular pattern
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the rays of light coming from different directions meet at a point, then the collection of such rays is termed as a convergent beam of light.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

State whether true or false.
When the rays of light starting from a point source travel in various directions, then the collection of such rays is called a convergent beam of light.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the rays of light starting from a point travel in various directions then collection of such rays is called divergent beam of light

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A beam of light is made up of:

  1. Rays

  2. Droplets

  3. Clusters

  4. Groups
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A $ \bf{beam\ of\ light}$ is group of rays of light travelling in a particular direction. 
A $ \bf{ray\ of\ light} $ is the direction along which the light energy propagates.

Hence, the correct answer is OPTION A.
Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

State whether true or false:
In convergent beam of light all the light rays meet at a point.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If a parallel beam of light fall on a converging mirror or lens then they will also pass through focus i.e. all the rays will meet at a point of a convergent beam.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

Which of the following is true about observation of light?

  1. When we switch on the torch we can observe the beam of light

  2. Sun light can be observed in early morning when sun rises

  3. We can observed beam of light of sun through a hole

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

All the three statements are true that light is observed when switching on the torch, sunlight is observed in early morning and a beam of light can be observed through a hole.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

Physical processes are sometimes described visually by lines. Only the following can cross.

  1. Streamlines in fluid flow

  2. Lines of forces in electrostatics

  3. Rays in geometrical options

  4. Lines of force in magnesium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since in case of reflection or reflection of light rays, the image formation is the meeting/crossing of light ray's through a point.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A glass slab is placed in the path of convergent light.. The point of convergence of light .......... .

  1. moves away from the slab

  2. moves towards the slab

  3. remains at the some point

  4. undergoes a lateral shift
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a convergent beam of light passes through a glass slab, the light rays are refracted towards the normal upon entering and away from the normal upon exiting. This causes the point of convergence to shift further away from the slab.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

Which of the following statement is true?

  1. All light is electromagnetic wave

  2. Electromagnetic energy is created only by heat

  3. Matter emits a single, unique photon when it is heated

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

Option A $\rightarrow $ All light is electromagnetic wave. This option is correct as EM light does not need any medium to travel like EM wave.

Option B $\rightarrow $ Electromagnetic energy created only by heat.
                    This option is false.
Electromagnetic energy can be created in any case of accelerated charge.
Option C $\rightarrow $ When matter is heated many photos are ejected.
                     So this option is false.

Multiple choice physics option a: relativity maxwell's equations the nature of light introduction to electromagnetic waves

According to the electromagnetic wave theory, light consists of electric and magnetic fields which are __________.

  1. parallel to each other

  2. perpendicular to each other
  3. inclined at an angle of ${45}^{o}$ to each other

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

Light consists of electric and magnetic field that are perpendicular ${ 90 }^{ 0 }$ to each other.
APPOACH by example
Electric field inside plates. The magnetic field this given rise to via the displacement current is along the perimeter of the circle parallel to capauatates plates.

So B and E are perpendicular in this case.