Question

pls answer this question​

Answer 1

$\large{\frac{8}{15} }v$

Formula Used

R.I of a medium =

$\frac{</strong><strong>v</strong><strong>elocity \: of \: light \: in \: air \: or \: vaccum \: }{</strong><strong>v</strong><strong>elocity \: of \: light \: in \: that \: medium \: }$

Symbol Used in the Picture

C = Velocity of light in Air or Vaccum

R.I = Refractiveindex

v' = I assumed

How to Understand This Concept

Just Study the Concept of R.I from NCERT