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Oppenheimer1945
Joined: 16 Jul 2019
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GMAT Focus 1: 645 Q90 V76 DI80 
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Schools: INSEAD '26 (D) ISB '27 (D) IIMB '26 (A) IIMA '26 (A) HEC '26 (D) LBS '26 IESE '27 (D) Fuqua '27 (WL) Tepper '27 (WL)
GMAT Focus 1: 645 Q90 V76 DI80
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16 Aug 2023, 10:49
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Approaching in a Scientific Way:
Every moving object captured during a long exposure with a large aperture lens (say F1.4) will show the trails. If there is motion by the time the aperture is open, the trail is captured.
Refer image. Star Trails captured shows the lens was opened for a large time and there was certain motion of star (around the sky) captured .
Astrophotographers maintain a combination of F no, ISO and Exposure time to avoid trails. Or this can happend if the camera slips a bit in the tripod , leaving fake trails). You can create fake aurora if you focus a green laser in sky and move it to and fro and let the long exposure capture the trail.
Bottomline: If the light from the object is detected for a very small fragment of time compared to the time the shutter is open, it will not leave trail.
Only D captures this essence of reasoning.
Every moving object captured during a long exposure with a large aperture lens (say F1.4) will show the trails. If there is motion by the time the aperture is open, the trail is captured.
Refer image. Star Trails captured shows the lens was opened for a large time and there was certain motion of star (around the sky) captured .
Astrophotographers maintain a combination of F no, ISO and Exposure time to avoid trails. Or this can happend if the camera slips a bit in the tripod , leaving fake trails). You can create fake aurora if you focus a green laser in sky and move it to and fro and let the long exposure capture the trail.
Bottomline: If the light from the object is detected for a very small fragment of time compared to the time the shutter is open, it will not leave trail.
Only D captures this essence of reasoning.
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image_2023-08-16_231206449.png [ 676.4 KiB | Viewed 785 times ]
21 Aug 2023, 10:40
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The argument is discussing a photograph of the night sky taken with a long exposure time where the normal motion of stars caused streaks, but one bright spot did not streak. The argument is trying to explain why this spot might not be streaked even if it's caused by a celestial object.
The key here is to find a reason why a celestial object could still appear as a bright spot without streaking. This reason must relate to the extended exposure time of the camera shutter.
(A) the spot was not the brightest object in the photograph
(B) the photograph contains many streaks that astronomers can identify as caused by noncelestial objects
(C) stars in the night sky do not appear to shift position relative to each other
(D) the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open
(E) if the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects
The correct choice here is (D) because it provides a logical reason for why the bright spot could remain un-streaked. If the spot was caused by an object emitting a flash that lasted for only a fraction of the time that the camera shutter was open, then it would appear as a bright spot without streaking, even if the object was moving across the sky during the exposure. This explains why the bright spot is not streaked while still allowing for the possibility that it's caused by a celestial object.
The key here is to find a reason why a celestial object could still appear as a bright spot without streaking. This reason must relate to the extended exposure time of the camera shutter.
(A) the spot was not the brightest object in the photograph
(B) the photograph contains many streaks that astronomers can identify as caused by noncelestial objects
(C) stars in the night sky do not appear to shift position relative to each other
(D) the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open
(E) if the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects
The correct choice here is (D) because it provides a logical reason for why the bright spot could remain un-streaked. If the spot was caused by an object emitting a flash that lasted for only a fraction of the time that the camera shutter was open, then it would appear as a bright spot without streaking, even if the object was moving across the sky during the exposure. This explains why the bright spot is not streaked while still allowing for the possibility that it's caused by a celestial object.
05 Dec 2025, 06:52
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