Answer:
t = 1.6667 10⁻⁷ m
Explanation:
When light falls on a thin film on the surface we have two phenomena
- a change in phase when the beam passes to a medium with a higher index
- on the other hand, in the wavelength, due to the refractive index of the medium
λ = λ₀ / n
The second ray reflected from the other surface has no phase change
So the path difference between the two rays for destructive interference is
2t = m λ₀ / n
t = m λ₀ / 2n
Let's calculate
t = 1 500 10⁻⁹ / 2 1.50
t = 166.67 10⁻⁹ m
t = 1.6667 10⁻⁷ m
Answer:
The thinnest the sheet can be is 8.33 * 10^-8
Explanation:
λ = 500 nm = 500 * 10^-9
n = 1.50
The thinnest can be calculated using the formula;
2nd = (m+1/2)λ
thinnest, m = 0
2d (1.50) = (0+ 1/2) (500 x 10^-9 )
3d = 2.5 * 10^-7
d = 2.5 * 10^-7/3
d= 8.33 * 10^-8
Therefore, the thinnest sheet will be 8.33 * 10^-8
