Question

what is refractive index​

Answer 1

Solution:

$\bigstar \: \underline{\boxed{ \sf{ \red{Refractive \: index:}}}}$

• Refractive index of medium is defined as ratio of velocity of light in vacuum to the velocity of light in medium.
• Refractive index is represented by $\eta$ or $\mu$

Mathematically,

$\circ \: \boxed{ \purple{ \sf{ \eta = \dfrac{velocity \: of \: light \: in \: vacuum}{velocity \: of \: light \: in \: medium} }}} \: \circ$

✏ Refractive index of medium 1 wrt medium 2 is given by...

$\circ \: \boxed{ \sf{ \pink{ \large{ \eta _ {12} = \dfrac{ \eta _ 1}{ \eta_2} }}}} \: \circ$

⏭ Additional information:

• Refractive index is an unitless as well as dimensionless quantity.
• Refractive index of water is 4/3
• Refractive index of glass is 3/2