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

Irregular reflection occurs due to:

  1. failure of laws of reflection

  2. irregularity in reflecting surface

  3. irregular light

  4. all of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Irregular reflection occurs when parallel rays of light are incident on an irregular or rough surface and after reflection emerge in different directions. This type of reflection occurs due to irregularity of the reflecting surface.

Regular reflections occur from smooth or polished surfaces.

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

Mark the statement which is true for diffused reflection:

  1. Diffused reflection is due to failure of laws of reflection

  2. It is caused due to irregularities in the reflecting surface

  3. When the incident light is diffused in nature it causes diffused reflection

  4. All are true
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diffused reflection is not due to failure of laws of reflection but it is due to irregularities in the reflecting surface, like that of cardboard.

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

Diffused reflection

  1. may produce image

  2. never produce image

  3. must produce image

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

Diffused reflection occurs on rough surfaces. While it scatters light, it can still form images if the surface is not perfectly irregular, though they are often less sharp than those from specular reflection.

Multiple choice commercial applications sources of water conservation of natural and energy resources energy conservation and sources importance of the conservation of natural resources reduce, recycle, reuse

CFL is

  1. Chlorofluoro lamp

  2. Compact fluorescent lamp

  3. Compact fluorescent light

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CFL is compact fluorescent light. Compact fluorescent light bulbs are used in place of incandescent bulb because they use about 1/7$^{th}$ of the power used by the incandescent bulb. Hence, they are highly efficient in saving electricity.

Thus, the correct answer is option C.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

If a plane mirror makes an angle of ${120^0}$ with x-axis, then  a ray of light, incident on it along x-axis, after reflectionmay pass through point.

  1. (1,1)
  2. $\left( {1,\sqrt 3 } \right)$

  3. (3,1)

  4. (1,2)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mirror is at 120 degrees to the x-axis. A ray along the x-axis hits the mirror at an angle of 60 degrees relative to the normal. By reflection laws, the reflected ray makes an angle of 120 degrees with the x-axis. The line equation is y = -sqrt(3)x + c. Testing the point (1, sqrt(3)) fits the geometric path.

Multiple choice evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

We can see the objects only when:

  1. reflected light from the objects reaches our eyes

  2. the objects absorb all the light

  3. when the objects allow all the light to pass through them

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

Objects can pnly be seen when light falls onto the object and is reflected back to our eyes to form an image on the retina.