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2d
comment On solving a two lens system
Because the role played by the first lens together with the first (real) object has been completely taken into account. This one at a time procedure even holds for any complex optical assembly such as a cascade of $n$ lenses. The response of the $k^{th}$ lens in the cascade is influenced by lenses $1$ to $k-1$ but once we know this response, we can use that as an input to find the response of the $(k+1)^{th}$ lens while again ignoring all other lenses.
2d
comment On solving a two lens system
At the end of the day, information is carried by the physical transmission of light. The notion of virtual images/objects mainly serves to ease the overall visualization of this flow while sign conventions allow the correct calculation of distances in each step. Also, the one at a time procedure holds for any complex assembly of lenses.
2d
comment On solving a two lens system
Maybe one notion was not clarified: As you go from left to right, you consider one optical component at a time. That is to say, at $I_1$ when you consider that the real image produced by $L_1$ = virtual object for $L_2$, you can then forget $L_1$ completely.
2d
answered On solving a two lens system
Sep
29
awarded  Yearling
Sep
26
comment Spontaneous parametric down conversion and relative time of emission of two entangled photons
The photons are emitted at the same time; see for instance journals.aps.org/prl/pdf/10.1103/PhysRevLett.25.84 You may also be aware of the Hong Ou Mandel experiment on two-photon interference using parametric down conversion. A much more comprehensive and detailed explanation of time resolution in two-photon interference experiments in general can be accessed at link.springer.com/article/10.1007%2Fs00340-003-1337-x which I would also recommend.
Sep
17
revised How to calculate the photoelectric effect with photon efficiency?
improving some mathematical expressions
Sep
17
suggested suggested edit on How to calculate the photoelectric effect with photon efficiency?
Sep
17
revised Phase shift in back-reflection generated at the mating point of two fibers
broke down the main question into two simpler questions
Sep
17
awarded  Student
Sep
17
asked Phase shift in back-reflection generated at the mating point of two fibers
Aug
22
comment When do we see particles to be in a superposition of energy states?
The statements in the first para will also hold true for statistical mixtures of the type $|a|^2 |E_1\rangle \langle E_1| + |b|^2 |E_2\rangle \langle E_2|$. To verify whether the prepared state is a superposition $a |E_1 \rangle + b |E_2 \rangle$ unambiguously, one must be able to see interference. As mentioned in the comment by user26143, this may be possible with say the position measurement.
Aug
21
suggested suggested edit on Where does deleted information go?
Aug
13
answered Can a Chemical's Opacity be Deduced Mathematically?
Jun
11
comment Can we fire a single femtosecond pulse of light without an associated train of additional pulses? What sort of equipment allows for this?
With regards to the requirement of the broad spectral range, you could also try a supercontinuum source, such as one by pumping a photonic crystal fiber (PCF). For example, emission wavelengths in the range of 150-500 nm can be produced using gas-filled hollow-core PCF (opticsinfobase.org/oe/abstract.cfm?uri=oe-21-9-10942).
May
4
comment Estimating quantum efficiency of gated avalanche photodiode
The APD is configured to apply a deadtime $\tau_d$ of a fixed no. of gates after detecting an avalanche. I could change the gating frequency, so I chose $f_1 < 1/\tau_d$. And I also pre-checked the attenuation of the VOA for a range of powers (as $\lambda$ was not the standard wavelength for that VOA) to get the offset.
May
4
asked Estimating quantum efficiency of gated avalanche photodiode
Apr
2
revised Advantage of taking qutrits in place of qubits
added 13 characters in body
Apr
2
answered Advantage of taking qutrits in place of qubits
Mar
4
answered Experiment under ambient light