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

The bouncing of a beam of light from a polished surface in some other direction is called -

  1. refraction

  2. reflection

  3. dispersion

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

$ \bf{Refraction} $ of light is the phenomenon of bending of light or change in the direction of light, when it passes obliquely from one transparent medium to another.

$ \bf{Reflection} $ is the phenomenon in which light rays on striking a polished surface(such as a mirror) bounce back or are sent back into the same medium. 

$\bf{Dispersion} $ is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.

$\bf{Scattering} $ is the phenomenon by which a beam of light is redirected or deflected in many different directions, when it passes through an imperfect medium, due to interaction with the particles of the medium.

Hence, the correct answer is OPTION B. 

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

According to the laws of reflection, angle of incidence is equal to angle of reflection.

  1. True

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

According to the laws of reflection, the angle of incidence made by the incident ray with the normal must be equal to the angle of reflection made by the reflected ray with the normal i.e.  $i=r$. So, the given statement is true.

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

A light ray makes an angle of incidence $60^o$, when it falls on a plane reflecting sheet.
The angle of reflection will be.

  1. $60^o$
  2. $30^o$
  3. $45^o$
  4. $90^o$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to laws of reflection angle of incidence is equal to angle of reflection, hence of $60^{0}$ angle of incidence, angle of reflection is also $60^{0}$.

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

Read the given statements and select the correct option.
Statement 1: When a ray of light passes from air into water, it will bent towards the normal.
Statement 2: When light travels from air into water, its speed increases.

  1. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

  2. Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.

  3. Statement 1 is true but statement 2 is false.

  4. Statement 1 is false but statement 2 is true.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When light travels from air Into water, Its speed decreases.

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
C 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.