mallya12 wrote:
workout,
GMATNinjaTwo,
u1983,
SajjadAhmad,
GMATNinja,
GnpthPlease explain Q1. Why is D right?? Where is the filtration taking place? I chose B because there is filtration.
Confused between B and D. Please explain.
Greetings
mallya12,
While the experts pour in their comments here are my 2 cents,
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The process through which an LCD monitor displays different colours is most closely analogous toIn the second paragraph, it is mentioned that " LCDs that are capable of producing colour images, such as in televisions and computers, reproduce colours
through a process of subtraction, blocking out particular colour wavelengths from the spectrum of white light until only the desired colour remains."The intent of the highlighted portion is that LCD
works by blocking out unwanted colour wavelengths and allowing only the desired ones to pass Option B- A series of filters that separate all of the components of a mixture according to size
This one just simply filters out all the particles, but our agenda is to filter the unwanted ones and let the desired ones pass.
I'll expand more by giving an example, suppose we have a mixture of sand, gravel, and stones. According to this option, LCD works by simply separating all the 3 components (i.e. LCD simply filters out all the different colour wavelengths and presents to us) according to size but that's not how LCD works, it works by blocking (or subtracting) the unwanted particles (=colour wavelengths) and letting the desired ones to pass. (
"until only the desired colour remains")
on the other hand, option D might not look the best at first glance, but it actually serves the intended meaning i.e blocking out the non-desired light (=colour wavelengths) and letting only the desired ones to pass.
D. A piece of construction paper with outlines of characters cut out such that a lamp in front of the paper casts shadows in the shapes of the
charactersI would be happy to expand further in case you have any questions. looking forward!