Question

2.
A light beam travels at a speed 1.94 x 108 m/s in
quartz. The wavelength found in quartz is 355 nm.
What would be the wavelength in air?
a) 755 nm
b) 355 nm
c)
954 nm
d)
594 nm​

Answer 1

Explanation:

Given: v  

q  =1.94×10  

8  m/s,    λ  q  =355 nm    

Speed of light in air: c=3×10  8 m/s

Let wavelength of light in air be λ  a

​ Using:  

λ  q v  q  =  λ  a   c ∴      355 1.94×10  8  =  λ  a 3×10 8 ⟹λ  a  =549 nm