Example sentences of "with the naked eye " in BNC.

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1 And their small size enables tiny arthropods , some almost too small to see with the naked eye , to live in crannies , within the soil , between sand grains , and the like .
2 The body louse may lay its eggs in clothing or bedding , while the head louse , like the crab louse , cements its eggs on to hairs forming ‘ nits ’ , which are the size of a pin-head and can just be made out with the naked eye .
3 Quite often , olivine and pyroxene begin to crystallize out early on , so they may be present in the final rock as quite large crystals , up to a centimetre across , many times larger than the crystals surrounding them , and easily visible with the naked eye .
4 He examined the pieces with the naked eye , then with his glass , while behind him Isobel held her breath .
5 The whiskers were too small to see with the naked eye and nobody could possibly make a testing machine on that scale .
6 The interesting point is that the Greeks were certainly able to see Merope with the naked eye , whereas today this is virtually impossible .
7 These eggs are so small they can not be seen with the naked eye .
8 This behaviour is almost too quick to see with the naked eye .
9 It is maddening , since so often you can see traces of underdrawing on the painting 's surface just with the naked eye ! ’
10 The magnification tells you how much larger an object looks that if it were viewed with the naked eye .
11 I well remember the occasion when he discovered a brightish nova , just about visible with the naked eye and easily seen with binoculars .
12 The faintest stars normally visible with the naked eye are of magnitude 6 , and binoculars will go down to at least 8 ; my 20 × 70 pair will reach 9 .
13 With the naked eye , or with binoculars , it is possible to distinguish between two stars which differ by only a tenth of a magnitude .
14 Mu Cephei is only of the fifth magnitude ( at least , generally so ; it is somewhat variable ) , so that with the naked eye it is not impressive even though it is actually redder than Betelgeux .
15 These pairs are separable with the naked eye , but closer binaries — or , of course , optical doubles — require binoculars or a telescope .
16 I have never been confident that I can split them with the naked eye , but 7 × 50 binoculars make it easy enough .
17 There are several Cepheids well within binocular range , and some can be followed throughout their variations with the naked eye : Eta Aquilæ , Zeta Geminorum and Beta Doradûs , for example .
18 There are even several , in addition to the Pleiades , which can be seen with the naked eye ; Præsepe in Cancer ( the Crab ) and the Jewel Box in the Southern Cross are other examples .
19 More than a hundred are known , though only three ( Omega Centauri and 47 Tucanæ in the southern sky , and the Hercules globular in the northern ) are clearly visible with the naked eye .
20 However , there are two exceptions : the Magellanic Clouds , so named because they were recorded by the Portuguese explorer Magellan in his voyage round the world — though they must have been noticed earlier , because they are very bright — and the Large Cloud is visible with the naked eye even in moonlight .
21 It is clearly visible with the naked eye , close to Nu ( 4.5 ) .
22 I have never been able to see it with the naked eye ( as some observers claim to have done ) , but it is not hard to find with × 7 , and it is easy with × 8.5 .
23 Of course the fluctuations of Epsilon Aurigæ are noticeable with binoculars , or even with the naked eye , at the time of eclipse ; Eta makes a suitable comparison star .
24 Præsepe , nicknamed the Beehive , is one of the finest clusters of its type ; it is easily visible with the naked eye and is well seen with × 7 binoculars , while with × 12 and × 20 it is truly glorious .
25 M67 is in the field with Alpha ( 4.2 ) ; it is said to be visible with the naked eye , but I have never been able to confirm this , though with binoculars it is very easy indeed .
26 There is however one splendid open cluster , M41 , which is easily visible with the naked eye and is resolvable with × 20 binoculars ; various individual stars can be seen with lower magnifications .
27 The fainter component is of magnitude 4.2 , and as the separation is 376 seconds of arc the pair can be split with the naked eye ; of course binoculars show it well .
28 The spectral type is F. In general F-stars are said to be yellowish , but I have never seen any colour in Canopus , either with the naked eye or with optical aid ; to me it looks pure white .
29 The Eta Carinæ nebula is visible with the naked eye .
30 It is easy to find , because it is usually visible with the naked eye at about magnitude 5 , and is in the same binocular field with Beta ; to either side of it are Tau ( 5.1 ) and Sigma ( 4.9 ) , which act as good comparisons , though Tau is of type K and has been suspected of slight variability .
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