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 evs magic with mirrors dual nature of light nature and sources of light theories on light

Newton postulated his corpuscular theory of light on the basis of

  1. newton's rings

  2. rectilinear propagation of light

  3. colour through thin films

  4. dispersion of white light into colours
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rectilinear propagation of light.
According to Newton’s Corpuscular Theory of Light, light consists of very tiny particles called corpuscles. These corpuscles, on emission from the source of light, travel in straight line with high velocity.

Multiple choice evs magic with mirrors dual nature of light nature and sources of light theories on light

According to corpuscular theory, the velocity of light in the denser medium is greater than that in rarer medium.

  1. True

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

The corpuscles (light) would travel faster in the denser medium than in rarer medium. But later this is proved wrong. We know that light travels faster in the rarer medium than in denser medium.

Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

In torches, search lights and headlights of vehicles the bulb is placed:

  1. between the pole and the focus of the reflector

  2. very near to the focus of the reflector

  3. between the focus and centre of curvature of the reflector

  4. at the centre of curvature of the reflector
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In torches, search lights and headlights of vehicles the bulb is placed very near to the focus of the reflector to get a parallel beam of light through which we can see to a longer distance.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

When light moving in one medium falls at the surface of another medium, _______ light returns back to the same medium.

  1. all of

  2. a part of

  3. no

  4. either all or no

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Light moving in one medium when falls at the surface of another medium, part of light returns to the same medium. Some part is transmitted and the rest is absorbed.  No material is a perfect reflector. Almost all surfaces absorb some part of light.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Fill in the blank:

When angle of incidence increases, glancing angle of incidence ________.

  1. decreases

  2. increases

  3. remains same

  4. becomes zero
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Angle of incidence $+$ Glancing angle of incidence $=90^0$

So, Glancing angle of incidence $=90^0 -$ Angle of incidence
This means, when angle of incidence increases, glancing angle of incidence decreases,

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Fill in the blank:

When the angle of incidence increases, glancing angle of reflection _______.

  1. increases

  2. remains same

  3. decreases

  4. becomes infinite
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Angle of incidence $+$ glancing angle of incidence $=90^0$

So, glancing angle of incidence $=90^0 -$ angle of incidence
Now, glancing angle of incidence $=$ glancing angle of reflection
Therefore, glancing angle of reflection $=90^0 -$ angle of incidence
This means, when angle of incidence increases, glancing angle of reflection decreases,

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Bouncing of light into the same medium, from which the light ray is incident, is termed as

  1. Refraction

  2. Diffraction

  3. Reflection

  4. Scattering
Reveal answer Fill a bubble to check yourself
C 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{Diffraction} $ is the phenomenon of bending of light waves around the corners of an obstacle or aperture, placed in the path of light beam.

$ \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{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 the interaction with the particles of the medium.

Hence, the correct answer is OPTION C. 

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Reflection can occur on

  1. Transparent surfaces

  2. Translucent surfaces

  3. Opaque surfaces

  4. B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.
Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.
Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Since, transparent objects allow light to pass through them completely, no reflection can occur on them. 

Reflection occurs on translucent surfaces because they reflect a certain amount of light while allowing a certain amount of light to be transmitted. Reflection occurs perfectly on Opaque surfaces because they reflect all the light that falls on them without allowing any light to pass through them.

Hence, the correct answer is OPTION D.