Thin-Film Interference

The index of refraction of the thin film (water) is higher than air as shown in Figure above - the reflected ray will undergo a phase change of ½λ ( or π rad).

• TRUE

• FALSE

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

At the bottom soap-air interface ( soap film has a higher index of refraction n > 1) there will be a phase change for ray 2.

• TRUE

• FALSE

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

What is the path difference of the reflected rays traveling through the film?

• t

• 2nt

• t/2

• 0

Tags

NGSS.HS-PS4-1

What is the condition for the constructive interference of the thin film shown in figure above?

• 2t = mλ where m = 0,1,2,3,...

• 2nt = mλ where m = 0,1,2,3,...

• 2t = (m+½)λ where m = 0,1,2,3...

• 2nt = (m+½)λ where m = 0,1,2,3...

Tags

NGSS.HS-PS4-1

What is the condition for destructive interference to occur for the soap film shown?

• 2nt = mλ

• 2nt = (m+¼)λ

• 2nt = (m+½)λ

• 2nt = (m+¾)λ

Tags

NGSS.HS-PS4-1

. Every time light hits a "thin film" - there is a phase change occurs for the reflected ray.

• False

• True