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jonny [76]
3 years ago
9

The SI unit of refractive index is ___a)km/s. b)m/s. c)sec. d)no unit​

Physics
1 answer:
cupoosta [38]3 years ago
6 0

Answer:

d)no unit

Explanation:

refractive index is a unit less quantity.

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Which type wire should be used to increase resistance
8_murik_8 [283]

Nichrome wire. That's the stuff that toasters are made from. The resistance is pretty high, considering the diameter. 1 meter is at about the same guage as that listed below for copper is about 96 ohms.

Most of the time you are trying to use wire with the least resistance.

A meter of copper has a listed resistance of 0.024 ohms / meter. The wire is a 19 guage wire which makes it pretty thin.

===============

I'm not sure what you are asking. If want the resistance of something in terms of what would increase the resistance of the same material for both calculations then

Rule 1: It you decrease the wire diameter, you increase the resistance

Rule 2: If you increase the length of the wire, you increase the resistance.

Both rules assume you are using something like copper.

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3 years ago
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kifflom [539]

Answer:

The given statement is false.

Explanation:

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A concave mirror always forms real and inverted image. A convex mirror forms real and virtual images.

For concave mirror, the value of magnification is less that 1. Also, the focal length is negative for concave mirrors.

So, the given statement is false as a concave mirror always forms a real and inverted image. Hence, this is the required solution.

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soldi70 [24.7K]

Answer:

25N

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That should be right if im not dumb...

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