Advertisements
Advertisements
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)
Advertisements
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)`
APPEARS IN
संबंधित प्रश्न
Select the correct alternative
The speed of light is maximum in
State the speed of light in (a) air, (b) glass.
State whether light slows down or speeds up in the following cases :
Light going from water to air.
An obliquely incident light ray bends at the surface due to a change in speed when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have a different speed in the other medium?
The speed of light is maximum in ______.
Higher Order Thinking Skill.
What do you conclude about the speed of light in diamond. if the refractive index of diamond is 2.41?
Define transparent materials.
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.
Light travels a distance of '10x' units in time 't1' in vacuum and it travels a distance of 'x' units in time 't2' in a denser medium. Using this information answer the question that follows:
'Light covers a distance of '20x' units in time 't1' in diamond'. State true or false.
