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Ainat [17]
3 years ago
15

And object is 20 cm from the lens. The image from 6.66667 cm from the length. What is the focal length of the lens? Use the thin

lens equation

Biology
1 answer:
natita [175]3 years ago
5 0

Answer:

5

Explanation:

The object distance Is 20 I'm

The image distance is 6.666

Therefore the focal length can be calculated as follows

1/f = 1/20 + 1/6.66

= 6.66+20/133.2

= 26.66/133.2

1/f= 26.66/133.2

f = 133.2/26.66

= 4.99

= 5

Hence the focal length is 5

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1 year ago
Black coffee has a pH around 5; hand soap has a pH of 10. How many times more acidic is coffee relative
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Answer:

\boxed {\boxed {\sf 10^5 \ or \ 100,000 \ times \ more \ acidic}}

Explanation:

The pH scale stands for the power or potential of hydrogen. It measures how acidic or basic a solution based on the concentration of hydrogen ions and a scale from 1 to 14.

This scale is unique because it is logarithmic. So, every time the pH changes by 1 on the scale, the actual concentration of the solution increases or decreases by a tenfold.

So, a solution with a pH of 7 is ten times more acidic than a solution with a pH of 8. This can be translated to:

10^ {difference \ in \ pH}

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Coffee is <u>10⁵ or 100,000 times more acidic than hand soap.</u>

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8 0
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