#wave optics

[artemisthevirginhunter]

MOOD- THIS WEEK;

Starting Wave optics from Physics (Pearson) by James S. Walker, today for revision and extra study.

Got myself a collective PDF of Anne Rice's "The Vampire Chronicles".

[academiawho]

Just before CBSE 2022

[Important points and graphs from Wave Optics]

[studywithlocaldumbass]

Day 8/50 of 50 days productivity challenge

Tomorrow's my physics exam and I don't wanna give 😔 we all have decided to bunk tomorrow's exam the only problem being our paranoid class teacher might make our lives hell for being absent tomorrow. Let's see what happens. Gonna study ray optics and wave optics today

[notsomuchsheldoncooper]

17 February, 2020

TASKS FOR THE DAY

complete backlog from yesterday ( hehe I knew I wouldn't get everything done lol)

Electrochemistry ( NCERT + videos on Khan Academy)

Coordination chemistry ( NCERT)

Physical education ( another chapter for boards)

Wave optics ( Derivations + formulae)

Semiconductors ( derivations + formulae)

[journeythroughphysics]

Day 2/100 : learned about the Michelson interferometer, in preparation for an internship

[slinkybun]

Wave Optics:

The speed of a wave (c) Refractive index (n) Wavelength (λ) Frequency (𝑓) c= 3*10^8 m/s c= 𝑓λ v= c/n = 𝑓λ/n

When light moves from one medium into another, its frequency stays the same, while both the speed and wavelength generally change. Example Problem 1:

Orange light of wavelength λ = 600 nm in air enters water having an index of refraction of 𝑛 = 1.33. (a) What is the frequency of this light? (b) What is the speed of the light in the water? (c) What is the wavelength of the light in the water? (d) If you were swimming underwater and looked at this light, what color would you see?

(a) 𝑓= c/λ = 3*10^8 / 600*10^-9 = 5*10^14 (b) v= c/n = 3*10^8 / 1.33 = 2.26*10^8 (c) 𝑓= c/λ => 2.26*10^8 = (5*10^14) λ => λ= 4.52*10^-7 m= 452 nm (d) Trick question. Red, because human eyes pick up on frequency under water. The plane in which the electric field oscillates is called the plane of polarization.

The intensity 𝐼 of a beam of light is the energy per second per square meter carried by the light. It turns out that the intensity is proportional to the square of the electric field amplitude.

We can measure the intensity of a beam of light.

To double the intensity of an electromagnetic wave, you should increase the amplitude of the electric field by a factor of 1.414.

Light waves can be manipulated to control the orientation of the electric field vector. Most light is unpolarized – electric field vectors point randomly in all directions. A polarizer transmits only one component of the electric field vector to create light that is linearly polarized – the electric field is constrained to one plane.

A polarizer allows transmission of the electric field component parallel to its axis. Consider light that has an electric field of amplitude 𝐸0. Then if the polarizer axis is at angle 𝜃 with respect to the electric field, the transmitted electric field amplitude is: 𝐸(𝜃) = 𝐸0 cos 𝜃 The transmitted intensity 𝐼 (proportional to 𝐸^2) is 𝐼 = 𝐼0 cos^2 𝜃 where 𝐼0 is the incident wave intensity in watts per square meter. (W/m^2)

[quietimtryingtostudy]

Two independent light sources can never be coherent 

[journeythroughphysics]

More work on diffraction: diffraction through a rectangular aperture, circular aperture, diffraction through two or more slits.