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प्रश्न
Numerical problem.
Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Ans: 2 × 108 ms–1)
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उत्तर
Given: Refractive index (µ) = 1.5
Speed of light in vacuum (c) = 2 × 108ms– 1
Speed of light in glass (υ) = ?
Solution:
µ= `"Speed of light in vacuum (c)"/"Speed of light in glass (υ)"`
1.5 = `(2×10^8"ms"^(-1))/"υ" ⇒ "υ" = (2×10^8"ms"^(-1))/1.5= 1.3 × 10^8 "ms"^(-1)`
∴ Speed of light in glass = `1.3 × 10^8 "ms"^(-1)`
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संबंधित प्रश्न
State whether light slows down or speeds up in the following cases :
Light going from air to glass.
State whether light slows down or speeds up in the following cases :
Light going from glass to water.
A light ray passes from water to
- air, and
- glass.
In each case, state how does the speed of light change.
Compare the speeds of light of wavelength 4000 Å (i.e. violet light) and 8000 Å (i.e. red light) in vacuum.
Objects that allow light to pass through partially are called ______ material.
Materials that are not able to allow light to pass through, are called ______ material.
Define transparent materials.
Define opaque material.
The speed of light decreases in a denser medium, light bends towards the normal.
Two medium with a refractive index of 1.31 & 1.50 is given. In which case
- The bending of light is more and
- speed of light is more.
