Lecture_18

Lecture_18 - Lecture 18-1 Lecture Newtons Ring The air...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 18 Lecture 18 -1 The air between the glass plates acts like a thin film. • Since the thickness of the film changes over the radius of the plates, alternating bright and dark fringes form, when the plates are illuminated. Because of the curvature of the upper piece, the film thickness varies more rapidly at larger radius. Thus the fringe separation is smaller toward the outside . Newton’s Ring
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lecture 18 Lecture 18 -2 Physics 219 – Question 1 – March 23, 2011. Light of wavelength λ in air is incident near normally to a thin layer of oil film (index of refraction n 1 =1.5) coating the surface of glass (n 2 =1.8). If the reflection turns out to be suppressed by the destructive interference of the rays 1 and 2 shown below, what is a possible thickness d of the oil film? A. λ /(4n 1 ) B. λ /4 C. λ /(2n 1 ) D. λ /2 E. 3 λ /4 1 2 glass (n 2 =1.8) air (n=1) oil (n 1 =1.5) d
Background image of page 2
Lecture 18 Lecture 18 -3 Two ( narrow ) slit Interference • Upon reaching the screen C, the two waves interact to produce an interference pattern consisting of alternating bright and dark bands (or fringes), depending on their phase difference.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

Lecture_18 - Lecture 18-1 Lecture Newtons Ring The air...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online