Question

Light of wavelength $6600\stackrel{\circ }{A}$ travelling in air gets refracted in water. If the speed of light in air is $3\times {10}^{8}m/s$ and R.I of water is 4/3. Find frequency of light in air.

• A. $2Hz$
• B. $4.54\times {10}^{14}m/s$
• C. $2.6Hz$
• D. $900\times {10}^{2}m/s$

Answer 1

Answer: (B)

$4.54\times {10}^{14}m/s$

${\lambda }_{air}=6600\times {10}^{-10}m$

$c=3\times {10}^{8}m/s$

$\mu =\frac{4}{3}$

$V_{air}=\frac{c}{{\lambda }_{a}ir}=4.54\times {10}^{14}Hz$