Tag: theories on light

Questions Related to theories on light

Which of the following is incorrect?

evs light and shadow dual nature of light nature and sources of light theories on light

  1. A thin convex lens of focal length ${f} _{1}$ is placed in contact with a thin concave lens of focal length ${f} _{2}$. The combination will act as convex lens if ${f} _{1}<{f} _{2}$

  2. Light on reflection at water-glass boundary will undergo a phase change of $\pi$

  3. Spherical aberration is minimized by achromatic lens

  4. If the image of distant object is formed in front of the retina then defect of vision may be myopia

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Correct Option: B

The speed of the light in the medium is :- 

evs light and shadow dual nature of light nature and sources of light theories on light

  1. maximum on the axis of the beam

  2. minimum on the axis of the beam

  3. the same everywhere in the beam

  4. directly proportional to the intensity I

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Correct Option: C

Which of the following quantities is not carried by light ?

evs light and shadow dual nature of light nature and sources of light theories on light

  1. Angular momentum

  2. Linear momentum

  3. Energy

  4. None of the above

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Correct Option: A

Choose the correct option about light.

evs light and shadow dual nature of light nature and sources of light theories on light

  1. Light requires a material medium to travel from one place to another

  2. Light does not require a material medium to propagate

  3. Light has mass but it is negligible

  4. Light waves are longitudinal wave

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Correct Option: B
Explanation:

Light does not need medium to travel. Its an electromagnetic wave. All electromagnetic waves travel independent of medium.

During the $19th$ century, light was considered to be a stream of particles called :

evs light and shadow dual nature of light nature and sources of light theories on light

  1. atoms

  2. electrons

  3. corpuscles

  4. quantas

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Correct Option: C
Explanation:

The corpuscular theory of light is proposed by newton in 1704. It is referred as particle theory or newton’s theory of light.

According to this theory,

a. Light is made up of tiny particles called corpuscles having negligible mass. These particles (corpuscles) are perfectly elastic.

b.These tiny particles always travel in straight line in all directions.

c. These corpuscles ravel at very high velocity.

These corpuscles are of different sizes. The different color of light is due to different sizes. 

When light falls on matter, it can produce :

evs light and shadow dual nature of light nature and sources of light theories on light

  1. mechanical effect

  2. chemical effect

  3. heating effect

  4. all the above

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Correct Option: D
Explanation:

since photons have momentum and energy, they can produce all the three stated effects

Albert Einstein used corpuscular theory to explain :

evs light and shadow dual nature of light nature and sources of light theories on light

  1. $E=mc^2$

  2. The photoelectric effect

  3. Quantisation of charge

  4. magic of light

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Correct Option: B
Explanation:

The photoelectric effect

In 1905, Albert Einstein published a paper in advancing hypothesis that the light energy I'd being carried in discrete quantized packets to explain experimental data from photoelectric effect. This model contributed the development of quantum mechanics.
Photoelectric effect refers to the emission, or rejection of electrons grim the surface of generally a metal in response to the incident light. 

Light is a form of _______ that we can detect with our ________ .

evs light and shadow dual nature of light nature and sources of light theories on light

  1. energy, ears

  2. corpuscles, eyes

  3. energy, eyes

  4. sensation, skin

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Correct Option: C
Explanation:

Light is a form of energy that we can detect with our eyes

The inability of a lens to bring all the rays coming from a point object to focus at one single point is called

evs light and shadow dual nature of light nature and sources of light theories on light

  1. Spherical aberration

  2. Parallex

  3. Optical illusion

  4. none

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Correct Option: A

Who amongst the following used corpuscular theory to explain the nature of light?

evs light and shadow dual nature of light nature and sources of light theories on light

  1. Max Planck

  2. Newton

  3. Young

  4. Einstein

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Correct Option: B
Explanation:

Newton was the first to use corpuscular theory to explain the nature of light. He was able to successfully reflection and refraction using this theory.