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प्रश्न
How does the speed of light determine the optical density of a medium?
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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.
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संबंधित प्रश्न
In the following diagram, the path of a ray of light passing through a glass prism is shown:
In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option):
(A) X, R and T
(B) Y, Q and T
(C) X, Q and P
(D) Y, Q and P
In the following ray diagram the correctly marked angle are:
(a) ∠i and ∠e
(b) ∠A and ∠D
(c) ∠i, ∠e and ∠D
(d) ∠r, ∠A and ∠D
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
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(a) violet
(b) yellow
(c) red
(d) green
Explain briefly, with the help of a neat labelled diagram, how white light gets dispersed by a prism. On which surface of a prism, there is both dispersion and deviation of light, and on which surface of the prism, there is only deviation of light ?
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
A wave has wavelength 50Å of State its one use.
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