Which distance can be most accurately measured with a ruler?

1 answer:

6 0

<span>The answer is a width of a textbook. It is usually has centimeter and millimeter units on it. Since rulers are most commonly 15 or 30 cm long, it could only be used to measure the length or width of small things like small tin, or the length of a piece of paper. A length of a river and the distance between two cities cannot be measured by a ruler, there is proper equipment for that, the same goes for the size of an object under the microscope. </span>

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Check attachment for the diagrammatic representation

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KatRina [158]

This question is based on the simple principle of the refraction.

Refraction is the optical phenomenon in which the light ray will change its direction when fall obliquely on a refracting surface due to the change of velocity of light in the refracting medium.

Greater the refractive index,the lesser will be the velocity of light in that medium.

As refractive index $= \frac{v_{1} }{v_{2} }$

Here $v_{1}$ is the velocity of light in first medium and $v_{2}$ is the velocity of light in second medium.

In case of light travelling from space to the medium we may write

$\mu=\frac{c}{v}$ where c is the velocity of light.

So as long as the medium is same ,there will be no change in the velocity of light.

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Now the light escaped through the glass.so it again enters the same medium i.e space. Hence the velocity of light will be increased now and will be equal to 'c' now .

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