Question
What is absolute refractive index? On what factors does it depend ?
✓
Answer
→The refractive index of a given medium with respect to vacuum is called its absolute refractive index.
$n =\frac{c}{v}$
→It is also equal to the ratio of speed of light in vacuum to speed of light in given medium.
→Refractive index is unitless.
→Dimensional formula: M0L0T0
→Value of refractive index of any medium depends on type of medium, temperature and wavelength of light.
→The refractive index of a medium and the wavelength of light in the same medium are inversely proportional to each other. $\left(n \propto \frac{1}{\lambda}\right)$
$n =\frac{c}{v}$
→It is also equal to the ratio of speed of light in vacuum to speed of light in given medium.
→Refractive index is unitless.
→Dimensional formula: M0L0T0
→Value of refractive index of any medium depends on type of medium, temperature and wavelength of light.
→The refractive index of a medium and the wavelength of light in the same medium are inversely proportional to each other. $\left(n \propto \frac{1}{\lambda}\right)$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Consider a gravity-free hall in which a tray of mass M, carrying a cubical block of ice of mass m and edge L, is at rest in the middle. If the ice melts, by what distance does the centre of mass of "the tray plus the ice" system descend?
A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 22° with the horizontal. The horizontal component of the earth’s magnetic field at the place is known to be 0.35 G. Determine the magnitude of the earth’s magnetic field at the place.
Suppose the platform of the previous problem is brought to rest with the ball in the hand of the kid standing on the rim. The kid throws the ball horizontally to his friend in a direction tangential to the rim with a speed v as seen by his friend. Find the angular velocity with which the platform will start rotating.
Sunita and her friends went to an exhibition. The guard standing there asked them to pass through a metal detector. Sunita's friends were first afraid but when Sunita told them the reason and explain its working.
Answer the following questions :
(a) State the principle on which metal detector works.
(b) If a person passing through metal detector has some metallic object then why does it produces sound?
(c) Tell two qualities of Sunita which she showed while explaining the reason for passing through it.
Answer the following questions :
(a) State the principle on which metal detector works.
(b) If a person passing through metal detector has some metallic object then why does it produces sound?
(c) Tell two qualities of Sunita which she showed while explaining the reason for passing through it.
State with reason why a photodiode is usually operated at a reverse bias.
Two capacitors of capacitance $3 \mu F$ and 4 $\mu F$ are charged separately from a 6 V battery. When the battery is removed, they get connected to each other. In which the negative plate of one capacitor is connected to the positive plate of the other. Calculate the total final energy.
→A $15.0 \mu F$ capacitor is connected to a $220 V , 50 Hz$ source. Find the capacitive reactance and the current (rms and peak) in the circuit. If the frequency is doubled, what happens to the capacitive reactance and the current?
→Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?
What is the impact parameter? Explain the trajectory of $\alpha$-particle from it.
→Write down Huygen's principle and explain how a new plane wavefront is formed at the end of a very small time interval.