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 light, shadows and images introduction to reflection of light light and sight images in plane mirror

If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incident must be _____

  1. $0^o$
  2. $30^o$
  3. $60^o$
  4. $90^o$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When light passes from one medium to another, it only continues in a straight line without refraction if the angle of incidence is 0 degrees (normal incidence).

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

A ray of light is incident on a plane mirror along a vector $\hat i+\hat j-\hat k$. The noemal on incident point is along $\hat i+\hat j$. Then unit vector along the reflected ray is:

  1. $ \dfrac { 1 }{ \sqrt { 3 } } \left( \hat { i } +\hat { j } +\hat { k } \right)$
  2. $-\dfrac { 1 }{ \sqrt { 3 } } \left( \hat { i } +\hat { j } +\hat { k } \right)$
  3. $ \dfrac { 1 }{ \sqrt { 3 } } \left( -\hat { i } -\hat { j } +\hat { k } \right)$
  4. $ \dfrac { 1 }{ \sqrt { 3 } } \left( -\hat { i } +\hat { j } +\hat { k }\right)$
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice

White light is...

  1. The absense of light

  2. All colors of light combined

  3. The first color in the rainbow

  4. Given off by incandescent light bulbs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White light is composed of the entire visible spectrum of colors. When these colors are combined, they appear as white light to the human eye.

Multiple choice

How do we see non-luminous objects?

  1. They produce light which reaches our eyes

  2. They shine light into our eyes

  3. They bend light into our eyes

  4. They reflect light into our eyes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Non-luminous objects do not produce their own light. We see them because light from a luminous source hits the object and reflects into our eyes.

Multiple choice

Light waves can..

  1. Reflect

  2. Travel through empty space

  3. Refract

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

Light waves can reflect (bounce off surfaces), refract (bend when changing media), and travel through a vacuum (empty space). Therefore, all these properties apply.

Multiple choice

Light passes completely through which objects?

  1. opaque

  2. transparent

  3. translucent

  4. it doesn't pass through anything
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transparent materials allow light to pass through them completely, which is why you can see clearly through objects like glass.

Multiple choice

A laser produces colored light.

  1. True

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

Lasers produce light that is monochromatic, meaning it consists of a single specific wavelength or color.

Multiple choice

What is a quality of intense pulsed light (IPL)

  1. coherent

  2. collimated

  3. invisible

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

Unlike lasers, which are monochromatic and coherent, IPL is polychromatic, meaning it emits light at multiple wavelengths.