Answer: Dark matter.
Explanation: Hope it helps :)
perimeter of a rectangle = 2(L+B)
90=2(L+B)
90/2=L+B
45=L+B
Answer:
Explanation:
Speed and medium are properties of a wave which is in common within an area of the spectrum of visible light. i.e;
Their medium of propagation
They both travel at the same speed ( speed of light )
The properties mentioned above are properties that define that wave is found within an area spectrum for visible light.
Wish I Could Help You!
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![= 550 * 10^{-9}\] m. D = 3.50*10^-6 m.](https://tex.z-dn.net/?f=%20%3D%20550%20%2A%2010%5E%7B-9%7D%5C%5D%20m.%0A%0AD%20%3D%203.50%2A10%5E-6%20m.)

Then you need to find x when n=1
or

≈θ for θ<<1 , so θ=

Then you can find rhe distance of<span> bright fringe from the center:</span>
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