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 human eye and colourful world scattering of light and its applications some natural phenomena of light effects of light

The rising and setting of sun appear red because of : 

  1. refraction

  2. reflection

  3. defraction

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

The reddish appearance of the sun at sunrise or sunset is due to scattering of light by the molecules of air and other fine particles in the atmosphere.


Hence the option D is the right answer

Multiple choice physics the human eye and the colourful world scattering of light and its applications some natural phenomena of light effects of light

CV Raman got the Nobel Prize for his experiment on :

  1. Dispersion of Light

  2. Reflection of Light

  3. Deflection of Light

  4. Scattering of Light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

C. V. Raman got noble prize for his free, transparent sample of a chemical compound, a small fraction of the light emerges in directions other than that of the incident (incoming) beam. Here it is all about scattering of light.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

During normal incidence of light:

  1. angle of incidence is $90^0$
  2. angle of incidence is $0^0$
  3. sum of angle of incidence and angle of reflection is $90^0$

  4. angle of incidence is greater than angle of reflection
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Angle of incidence and the angle of reflection measured from the normal drawn on the point of incidence.

During normal incidence the light is incident along the normal on the point of incidence.
So, angle of incidence is $0^0$.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

Two plane mirrors are inclined to each other at an angle $\theta$. A ray of light is reflected first at one mirror and then at the other. The total deviation of the ray is

  1. $2\ \theta$
  2. $240^{\circ}-\ 2 \theta$
  3. $360^{\circ}-\ 2\ \theta$
  4. $180^{\circ}-\ \theta$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a ray of light reflects off two mirrors inclined at an angle theta, the total deviation is 360 - 2*theta if the angle is measured in a specific way, but the standard formula for deviation after two reflections is 2*theta.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

If a plane mirror is fixed and the incident ray is turned by an angle $30$ clockwise direction then 

  1. the reflected ray will turn by $60$ in anti clock wise direction
  2. the reflected ray will turn by $30$ in anti clock wise direction
  3. the change in deviation produced for the reflected ray will be $30$ in anti clock wise direction
  4. the change in deviation produced for the reflected ray will be $60$ in anti clock wise direction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a mirror is rotated by an angle theta, the reflected ray rotates by 2 * theta in the same direction. Here, rotating the incident ray by 30 degrees clockwise is equivalent to rotating the mirror by 30 degrees counter-clockwise relative to the incident ray, or simply applying the law of reflection which dictates the reflected ray shifts by twice the angle of rotation.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

Amount of light reflected depends upon

  1. Nature of material of the object

  2. Nature of the surface

  3. Smoothness of the surface

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

Amount of light reflected depends upon nature of material of the object, nature of the surface and smoothness of the surface. If the material is opaque for an incident light, then the total amount of incident light gets reflected. Otherwise, a part of the incident light can get transmitted.  If the surface is smooth, the reflection is more, otherwise reflected light can get scattered. 

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

Transverse nature of light was confirmed by the phenomenon of the

  1. refraction of light

  2. diffraction of light

  3. dispersion of light

  4. polarization of light.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The phenomenon of polarization confirms that light is a transverse wave because for polarization, the light should have different components oscillating in the different planes and a transverse wave has the oscillations perpendicular to the direction of propagation of the wave.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

A rainbow is caused by _____________.

  1. Heavy downpour

  2. Refraction and reflection of sunlight

  3. Change in temperature

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

Rainbow is caused by reflection, refration and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It is a meterological phenomenon. It is caused in the presence of sunlight. It appears in the section of sky which is directly opposite to the sun.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Glass panes usually appear hazy because:

  1. water vapour settling on the tiny dust particles

  2. of chemical reactions

  3. it is the property of all transparent substances

  4. they are old
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Air contains some gases, water vapours and dust particles that stick to a transparent glass of windows and it appears hazy. 


This is because air is a composition which includes water vapour and some other dust particles that come and rest on the windows which are not wiped. That is why they look hazy.


Hence, option A is correct.