Advertisements
Advertisements
प्रश्न
How does the speed of light determine the optical density of a medium?
Advertisements
उत्तर १
If the speed of light in a medium is less than the speed of light in air, means the MEDIUM is DENSER than air.
If the speed of light is more than the speed of light in AIR, means the MEDIUM is LESS DENSER than air.
Speed of light is 1/density of medium
उत्तर २
- Definition of Optical Density: Optical density refers to how much a medium can slow down the speed of light compared to its speed in a vacuum.
- Speed of Light in Different Media: Light travels fastest in a vacuum (c = 3 × 108 m/s). When light enters a medium (like water, glass, or air), its speed decreases depending on the medium's optical density.
- Relation Between Speed and Optical Density: The greater the optical density, the slower the speed of light in the medium. For example, light travels more slowly in glass than in air because glass has a higher optical density.
- Refractive Index: The optical density is quantified using the refractive index (n), which is defined as: `n = c/v`
- Example:
- In air: n ≈ 1, light speed is almost the same as in a vacuum.
- In water: n ≈ 1.33, light slows down significantly.
- In glass: n ≈ 1.5, light slows down even more.
APPEARS IN
संबंधित प्रश्न
A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE.
(i) Write the name and cause of the phenomenon observed.
(ii) Where else in nature is this phenomenon observed?
(iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are :
(A) ∠i and ∠r
(B) ∠i and ∠e
(C) ∠i, ∠e and ∠D
(D) ∠i, ∠r and ∠e
Define the term dispersion of light.
The diagram below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. If the yellow light is replaced by a narrow beam of white light incident at the same angle, draw another diagram to show the passage of white light through the prism and label it to show the effect of prism on the white light.
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
Distinguish between an impure spectrum and a pure spectrum.
Suggest one way, in each case, by which we can detect the presence of Infrared radiations.
Which one of the following is involved for the formation of rainbow in the sky?
The periscope is an optical device with a polished surface that reflects the light falling on it.
During dispersion of white light by prism placed in air, for a particular value of angle of prism,
