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
A body of mass m is placed on a table. The earth is pulling the body with a force mg. Taking this force to be the action what is the reaction?
The masses of 11C and 11B are respectively 11.0114u and 11.0093u. Find the maximum energy a positron can have in the $\beta^+$-decay of 11C to 11B.
→Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magnetons (1 bohr magneton equals 9.27 × 10-24A-m2). The density of atoms in iron is 8.52 × 1028 atoms/m3.
- Find the maximum magnetization I in a long cylinder of iron.
- Find the maximum magnetic field B on the axis inside the cylinder.
Use Lenz’s law to determine the direction of induced current in the situations described by Fig.
- A wire of irregular shape turning into a circular shape;
- A circular loop being deformed into a narrow straight wire.
Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, give an estimate of the self-inductance of the coil.
Electrons are emitted from the surface when green light is incident on it, but no electrons are ejected when yellow light is incident on it. Do you expect electrons to be ejected when surface is exposed to (i) Red light and (ii) Blue light?
A short bar magnet placed with its axis at 30º with a uniform external magnetic field of 0.25 T experiences a torque of magnitude equal to 4.5 × 10–2 J. What is the magnitude of magnetic moment of the magnet?
Two voltameters, one having a solution of silver salt and the other of a trivalent-metal salt, are connected in series and a current of 2A is maintained for 1.50 hours. It is found that 1.00g of the trivalent-metal is deposited.
- What is the atomic weight of the trivalent metal?
- How much silver is deposited during this period? Atomic weight of silver is 107.9 g/mole.
Suppose, we think of fission of a $^{56}_{26}\text{Fe}$ nucleus into two equal fragments, $^{28}_{13}\text{Al}.$ Is the fission energetically possible? Argue by working out Q of the process. Given $\text{m}(^{56}_{26}\text{Fe})=55.93494\text{ u and m }(^{28}_{13}\text{Al})=27.98191\text{ u}.$
→The refractive index of the material of a convex lens is 1.5 and the radii of curvature of both its surfaces are equal. Prove that its focal length is equal to the radius of curvature.