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 wave optics refraction of water waves reflection and refraction at plane surfaces theories on light

Which of the following statement is incorrect about the Raman effect?

  1. Raman effect can be seen by passing a monochromatic beam of light through benzene

  2. During scattering, the wavelength of the light used may change
  3. The wavelength of the monochromatic light used to show the Raman effect is approximately $4358$ $\overset{o}{A}$

  4. In Raman scattering the wavelength of the scattered light is the same as that of the incident light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Raman effect involves inelastic scattering of light, meaning the wavelength of the scattered light is different from the incident light (Stokes and anti-Stokes lines).

Multiple choice physics electric circuits introduction to diodes circuit components junction diode and its voltage current characteristics

For detecting the light_______________.

  1. The photodiode has to be forward biased

  2. The photodiode has to be reversed biased

  3. The LED has to connected in forward bias mode

  4. The LED has to be connected in reverse bias mode
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Photo diode is used to detect light. 
In reverse biased condition, the width of depletion region increases as the the applied reverse bias voltage increases across the diode. So, by applying a larger voltage, more of the incident photons are converted to electric current thereby increasing the efficiency.
In forward biased condition, the width of depletion region decreases so only a small portion of the incident photons get converted to electric current and hence the efficiency is less.
Hence photo diode in reverse biased condition detects light.
Therefore the correct option is (B).
Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

What are transparent materials?

  1. The material which does not allow light to pass through it.

  2. The material which allows light to pass through it.

  3. The material through which light can pass partially.

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

Materials which allow light to completely pass through them without getting scattered are called Transparent material.

Example- a glass of water, clear eyeglasses.

Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

What do you call a substance through which things are partially visible?

  1. Opaque object

  2. Transparent object

  3. Lustrous object

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

The material which does not allow light to pass through it is called opaque and material which allows light to pass through it is called transparent. The material through which light can pass partially is called translucent, e.g. butter paper.

Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

Translucent substances  __________.

  1. allow the light to pass through it completely

  2. allow the light to pass through it partially

  3. does not allow the light to pass through it

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Those materials that allow some light to pass through them are called translucent and include things like frosted glass and wax paper.

Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

Which of the following type of bodies form sharp shadows when placed in the path of light?

  1. Transparent

  2. Translucent

  3. Transparent and translucent

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

Transport bodies allow light to pass through it while translucent bodies allow light partially through it but opaque bodies do not allow light to pass through it, so they form sharp shadows when placed in the path of light.

Option (D) is correct.

Multiple choice evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

Which of the following type of bodies form sharp shadows when placed in the path of light?

  1. Transparent

  2. Translucent

  3. Both A and B

  4. Opaque
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). 

When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted. 

Opaque object forms sharp shadow when placed in the path of the light.

Hence, option D is correct.
Multiple choice evs magic with mirrors kaleidoscope uses of plane mirror reflected light can be reflected again

Shall a kaleidoscope work in a dark room?

  1. Yes

  2. No

  3. Sometimes

  4. Can't say
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A kaleidoscope works on the principle of multiple reflections. In order to make the reflections occur, light enters a kaleidoscope through a hole. In a dark room, no light is present. So, no light will enter the kaleidoscope and no reflections will be seen. So, a kaleidoscope will not work in a dark room.

Multiple choice evs magic with mirrors kaleidoscope uses of plane mirror reflected light can be reflected again

If the tube of a kaleidoscope is filled with thick black smoke, the pattern:

  1. will change and will not be observable

  2. will not change and will not be observable

  3. will not change and will be observable

  4. will change and will be observable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern depends upon the positioning of the object and the mirrors. So, the pattern will not change. But, as the tube is filled with thick black smoke, no light will come out to the eye piece. So, the pattern will not be observable.

Multiple choice energy in wave motion oscillation and waves waves physics

To determine the position of a point like object precisely ______ light should be used.

  1. polarized

  2. short wavelength

  3. long wavelength

  4. intense
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
To determine the position of a point like object precisely light of short wavelength should be used.

Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

The bulbs which emit a bluish light, are

  1. filled with argon

  2. filled with nitrogen

  3. vacuum bulbs

  4. coated from inside with a light blue colour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because atoms and molecules can exist only in certain specific energy states, the energy emitted by the excited molecule is limited to differences between these states. Only certain energies of light are emitted. The colour of the glow is determined by the energy of the emitted light. and for argon its bluish

Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

Light of different colours propagates through air :

  1. with velocity of air

  2. with different velocity

  3. with velocity of sound

  4. with equal velocity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The velocity of the light does not change in air it will be equal for all the colours
  • If there may some other medium like water etc velocity will be changed
  • But it remains equal in air
  • Hence the option D is the right answer