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

Which of the following statements is/are true?

(a) The smaller the angle of incidence, the larger is the shadow formed. (b) The nearer the source of light, the smaller is the shadow formed. (c) When source of light is on top of a gas cylinder, a circular shadow will be formed.

  1. Only c

  2. Only b

  3. Only a

  4. Both a and c

  5. All are true
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, if the source of light is closer to the object, a larger shadow is formed than when the source of light is far from the object. The shadow of any cylindrical object will be a circle, when source of light is at the top.

Multiple choice

The rectilinear propagation of light means _____________.

  1. light travels in a straight line

  2. light travels in a curved path

  3. light travels in a circular path

  4. light travels in a zig-zag path

  5. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Light always travels in straight path, which is also known as rectilinear propagation of light.

Multiple choice

What type of surface reflects light well?

  1. Light coloured and smooth

  2. Dull and dark

  3. Dark coloured and smooth

  4. Any surface

  5. Depends upon the type of light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Light coloured and smooth surface reflect light well.

Multiple choice

Light travels ___________.

  1. the fastest in vacuum

  2. the fastest in air

  3. the fastest in water

  4. slower than sound

  5. with the same speed in every medium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

2.99X108 m/s

Multiple choice

Which of the following statements is false regarding the properties of a homogeneous mixture?

  1. The particles of a homogeneous mixture are less than one nanometre in size.

  2. The boundaries of particles cannot be differentiated.

  3. A homogeneous mixture shows Tyndall effect.

  4. When a ray of light is passed through a homogeneous mixture, the path of light is not visible.

  5. A mixture of salt and water is a homogeneous mixture.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer as this statement is false. A homogeneous mixture does not show Tyndall effect.

Multiple choice

A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?

  1. Red

  2. Green

  3. Yellow

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

 Resolution of the microscope is inversely proportional to the wavelenth of the light used.The light with short wavelength have the higher resolution.Out of the given options, blue light have the minimum wavelength, hence have highest resolution.