The wevelength of red light from He -Ne laser is 633 nm in air but 474 nm in the aqueous humor inside the eye ball . Then the speed of red light through the aqeous humor is

Options

A. A)`3xx10^(8)m//s`
B. B)`1.34xx10^(8)m//s`
C. C)`2.25xx10^(8)m//s`
D. D)`2.5xx10^(8)m//s`

Answer

C

Explanation

`("Speed of light in air ")/("Speed of light in aqueous humor")`
`=("Wevelength of light in air")/("Wevelength of light in aqueous humor")`
`rArr(v_(1))/(v_(2))=(lambda_(1))/(lambda_(2))`
or `v_(2)=(lambda_(2))/(lambda_(1))xxv_(1)=(474)/(633)xx3xx10^(8)`
`=2.25xx10^(8)m//s`