A monochromatic ray of light passes from air to glass The wavelength of light in air is λ - Physics - Refraction of Light

Question

A   m o n o c h r o m a t i c   r a y   o f   l
i g h t   p a s s e s   f r o m   a i r   t o
  g l a s s   T h e   w a v e l e n g t h   o f
  l i g h t   i n   a i r   i s   λ
  T h e   s p e e d   o f   l i g h t   i
n   a i r   i s   c   a n d   a n d  
i n   g l a s s   i s   v   I f   t h e
  r e f r a c t i v e   i n d e x   o f   g l a
s s   i s   1 5   W r i t e   d o w n a  
t h e   r e l a t i o n s h i p   b e t w e e n   c
  a n d   v b   T h e   w a v e l e n g t h
  o f   l i g h t   i n   g l a s s

Satyajit Ghosh · Accepted Answer