Reading time: 1 min 2 sec An objective is nothing but a compound lens, like a normal lens, the only difference is they are much more potent in terms of numerical aperture, resolution and magnification. In microscopes, objectives are mainly used with two optical designs: finite or infinite conjugate designs. In a finite optical design, the light from a spot is focused into another spot … Continue reading Finite and infinite conjugate objectives
Reading time: 2 min 14 sec. We know that a simple lens is a Fourier transform engine, which does complicated ‘Fourier calculations’ of any object faster than any computer available today! An object placed at a distance d from the lens forms its Fourier image at the back focal length (f) of the lens. As we know, Fourier image is always formed at the focal … Continue reading Taking Fourier plane out of an objective for angle-resolved measurements.
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It is quite possible to view the pulse stream of a femtosecond output on an oscilloscope screen, especially to measure the repetition rate of the laser. It is to be noted that, we cannot see the pulse shape of the laser beam as the response time (rise and fall time) of the photodiode (PD) is quite higher than the pulse width of the femtosecond laser.
Things to be noted:
Reading time: 2 min 34 sec You know how a car moves. It takes a lot of force for an engine to start and accelerate a car. It consumes a lot of fuel during the process of acceleration. After attaining the desired momentum, it only requires very less power from the side of the engine. But then the air resistance and ground friction come into … Continue reading Your mind and a car: An analogy
Reading time: 4 min 35 sec A few days back, I was in a friendly debate with one of my best friends. As usual, it was about the existence of God. He made this statement, ‘”Our eyes have a limitation in seeing objects. It can’t see smaller things beyond an extent. Our ears are also limited so that we can only hear in the frequency … Continue reading How religion bends our thinking ability?
Reading time: 2 min 57 sec I recently watched a youtube video where Dr Zakeer Naik says to a bright medical student that a ‘theory’ in science will only become ‘law’ after testing and verifying its correctness using scientific methods. I got shocked listening to this nonsense. Here is a man with the title ‘Dr’ (physician, I guess) who is supposed to educate himself at least with … Continue reading Time to be smart: ‘Fact’, ‘Law’, ‘Hypothesis’ and ‘Theory’ in Science.
Reading time: 3 min 37 sec A few days back, we were planning to go for a movie, and suddenly one of my friends raised her concern, “I am not coming. The road would be heavily busy, I hate it. I can’t handle it.” I exclaimed, “But you have come many times before.” It was her reply that made me write this post. She replied, … Continue reading Overthinking and worries: Causes and solutions
Reading time: 1 min 24 sec Once my friend, who is a believer of a set of religious rules, said “I don’t believe in science because it says something now and it says something else later. It’s so uncertain.” I replied “Hold on a second. So you believe in statements which never change? Good… And do you even bother to think … Continue reading On the uncertainty of explanations: Religion vs Science
Reading time: 4 min 22 sec. There was always a conflict alive within my thoughts about the concept of productivity and creativity. By default, I never liked the word productivity, since it is a typical multinational cooperate word which is generally used by big bosses to multiply their production efficiency and profit acquirement. So I hated to be productive! Whenever someone says me to be … Continue reading Productivity vs Creativity: And how do they merge?
Reading time: 12 sec What are good actions? What are bad actions? Simple. Good actions are those which you do as a result of any selfless thoughts. Bad actions are those that come from your ego. In fact, the action itself is neutral, neither good nor bad. It is our perspective that makes an action good or bad. Continue reading Actions: Good and Bad