Physics · Science General

Optics and Light Properties

2,013 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

What divides the angle of deviation into equal parts?

  1. The incident ray

  2. The reflected ray

  3. The normal

  4. The plane surface of mirror
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. It is the perpendicular on mirror, which divides the angle of deviation into two equal parts. One is angle of incident and the other is angle of reflection.

Multiple choice

The second law of reflection states that

  1. The angle of incidence and the angle of reflection are made on the normal.

  2. The incident ray, the relected ray and the normal lie in the same plane.

  3. The angle of incidence is equal to angle of reflection.

  4. The ray, which comes from the source falls on the mirror is called incident ray.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. The reflected ray leaves the mirror at the same angle at which the incident ray strikes.

Multiple choice

Which type of surface reflects the maximum light?

  1. An opaque surface

  2. A transparent surface

  3. A translucent surface

  4. A smooth shiny surface
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Yes, it is correct. It reflects almost all the light that falls on it and its surface is shiny and polished.

Multiple choice

Why is red light used in traffic signal for stopping the vehicles?

  1. It is visible even to longsighted people.

  2. Eye is more sensitive to red light.

  3. It is least scattered and hence can be easily noticed from long distance.

  4. It is very pleasant to the eye.

  5. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

White light is made up of 7 colors. Red colour, due to its longer wavelength does not get scattered by the particles in the atmosphere n hence reaches our eyes more distinctly than the other colors minus much scattering. Green gets scatterd more red but less than blue, which r d basic colours. Hence, red is used 4 stop n danger while green if for GO!</span>.</p>.

Multiple choice

Which of the following is not true of G-light bands?

  1. They fluorescence brightly with quinacrine

  2. They are GC-rich

  3. They are rich in expressed genes.

  4. They are loosely packed.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

G-light bands, for the most part, exhibit dull quinacrine fluorescence.

Multiple choice

Directions: This question presents a sentence, all or part of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

It is by observing the play of cosmic light and shadow through powerful devices scientists have been able to 'feel' shapes or 'see' shadows that indicate the existence of other heavenly bodies without actually seeing them.

  1. scientists have been able to 'feel' shapes or 'see' shadows that indicate

  2. scientists have been able to 'feel' shapes and 'see' shadows that indicate

  3. that scientists have been able to 'feel' shapes or 'see' shadows and that indicate

  4. that scientists have been able to 'feel' shapes or 'see' shadows that indicate

  5. scientists have been able to 'feel' shapes and 'see' shadows indicate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is through x 'that' the scientists have been able…

Multiple choice

The principle of working of a periscope is based on

  1. Reflection only

  2. Refraction only

  3. Reflection and refraction

  4. Reflection and interference
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A periscope uses two plane mirrors placed parallel to each other at an angle of 45 degrees to reflect light downwards around obstacles. This operation relies entirely on the law of reflection without involving refraction.

Multiple choice

An ordinary tubelight used for lighting purposes contains

  1. fluorescent materials and an inert gas

  2. one filament, reflective material and mercury vapour

  3. fluorescent material and mercury vapour

  4. two filaments, flurescent material and mercury vapour
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A tubelight contains two filaments (for starting), fluorescent material coating (to convert UV to visible light), and mercury vapor (to produce UV when ionized).

Multiple choice

The device that separates light into its component wave lengths is

  1. Photometer

  2. Interferometer

  3. Spectrometer

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

A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, separating polychromatic light into its component wavelengths. Photometers measure light intensity, while interferometers use interference patterns.