Tag: dual nature of light

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

Light of wavelength $\lambda $ from a point source falls on a small circular obstacle of diameter d. Dark and bright circular rings around a central bright spot are formed on a screen beyond the obstacle. The distance between the screen and obstacle is D. Then , the condition for the formation of rings, is

  1. $\sqrt { \lambda } \approx \cfrac { { d } }{ 4D } $
  2. $\lambda \approx \cfrac { { d }^{ 2 } }{ 4D } $
  3. $d\approx \cfrac { { \lambda }^{ 2 } }{ D } $
  4. $\lambda \approx \cfrac { D }{ 4 } $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The condition for diffraction rings around a circular obstacle (Poisson spot) is related to the Fresnel zone plate condition, where lambda is approximately d^2 / 4D.

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

Which of the following is incorrect?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice evs light and shadow dual nature of light nature and sources of light theories on light

Choose the correct option about 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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  1. atoms

  2. electrons

  3. corpuscles

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

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

Albert Einstein used corpuscular theory to explain :

  1. $E=mc^2$

  2. The photoelectric effect

  3. Quantisation of charge

  4. magic of light
Reveal answer Fill a bubble to check yourself
B Correct answer
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.