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# The visual phenomenon known as refraction alters the appearance of ob

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The visual phenomenon known as refraction alters the appearance of ob  [#permalink]

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29 Jan 2019, 09:45
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5% (low)

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91% (01:13) correct 9% (01:06) wrong based on 135 sessions

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The visual phenomenon known as refraction alters the appearance of objects as they are seen through water. All objects look larger than they actually are, but darker objects appear much more magnified than lighter objects. Hence, a darkly colored pebble on the floor of a swimming pool looks much larger than a white pebble, as long as the two are placed an equal distance from the eye of the viewer.

The conclusion above would be more properly drawn if it were made clear that the

A. darkly colored pebble is assumed to be greater in size than the white pebble

B. darkly colored pebble is assumed to be the same size as the white pebble

C. darkly colored pebble is assumed to be smaller in size than the white pebble

D. pool floor is light in color

E. pool floor is dark in color

Kudos for best explanation

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Re: The visual phenomenon known as refraction alters the appearance of ob  [#permalink]

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29 Jan 2019, 20:38
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The visual phenomenon known as refraction alters the appearance of objects as they are seen through water. All objects look larger than they actually are, but darker objects appear much more magnified than lighter objects. Hence, a darkly colored pebble on the floor of a swimming pool looks much larger than a white pebble, as long as the two are placed an equal distance from the eye of the viewer.

The conclusion above would be more properly drawn if it were made clear that the

A. darkly colored pebble is assumed to be greater in size than the white pebble- Dark pebble > white pebble- then refraction role is not confirmed

B. darkly colored pebble is assumed to be the same size as the white pebble- differentiate in normal light and refraction

C. darkly colored pebble is assumed to be smaller in size than the white pebble-

D. pool floor is light in color

E. pool floor is dark in color

Answer is B, because if size is same then differentiation is possible
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Re: The visual phenomenon known as refraction alters the appearance of ob  [#permalink]

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03 Feb 2019, 02:37
It is my opinion that in order for the the sentence to hold " Hence, a darkly colored pebble on the floor of a swimming pool looks much larger than a white pebble, as long as the two are placed an equal distance from the eye of the viewer." we need to make sure both pebbles are the same in size. Same size pebbles are required premise for the refraction mentioned on the discussion to work. If one is larger than the other pebble then it contaminates the refraction observed by human eye.
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Re: The visual phenomenon known as refraction alters the appearance of ob  [#permalink]

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03 Feb 2019, 03:47
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The question stem

"The conclusion above would be more properly drawn if it were made clear that the" makes us beleive that this is an assumption question.

Let's find the conclusion:

Dark colour pebble (DP)looks larger than WP given,
1) the viewing distance is same
2) darker objects look larger
3) refraction makes object look bigger.

Now let's look at assumption.

What if the size of WP and DP are actually different. In that case, even if the viewing distance is same the objects will appear different as they actually are different in size.

Hence the assumption is that the two pebbles are equal in size.

Clearly option B is the winner.

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Re: The visual phenomenon known as refraction alters the appearance of ob   [#permalink] 03 Feb 2019, 03:47
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# The visual phenomenon known as refraction alters the appearance of ob

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