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3 years ago

Which one of the following accurately describes a proper use of eyeglasses?

Physics

2 answers:

erastova [34]3 years ago

6 0

Answer:

B. Using diverging lenses to help a nearsighted person by moving the image from in front of the retina to the retina

Explanation:

To see an object, the light rays coming from the object must converge on the retina. Nearsightedness or myopia is the condition where the rays get converged before (or in front of) the retina. Thus the image on the retina will not be clear and the observer will not be able to see nearby objects.

To correct this we use a diverging lens which shifts the converging point or focus to the retina.

stiks02 [169]3 years ago

5 0

The statement that accurately describes a proper use of eyeglasses is statement A. Using converging lenses to help a nearsighted person by moving the image from in front of the retina to the retina.

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Answer:

nope don't think so

Explanation:

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3 years ago

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Suppose that the angular separation of two stars is 0.1 arcseconds, and you photograph them with a telescope that has an angular

Crank

Answer: the photograph will likely show only one star.

Explanation:

Since their angular separation is smaller than the telescope's angular resolution, the picture will apparently show only one star rather than two.

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3 years ago

Calculate the minimum average power output necessary for a person to run up a 12.0 m long hillside, which is inclined at 25.0° a

Viktor [21]

Answer:

Power, P = 924.15 watts

Explanation:

Given that,

Length of the ramp, l = 12 m

Mass of the person, m = 55.8 kg

Angle between the inclined plane and the horizontal, $\theta=25^{\circ}$

Time, t = 3 s

Let h is the height of the hill from the horizontal,

$h=l\ sin\theta$

$h=12\times \ sin(25)$

h = 5.07 m

Let P is the power output necessary for a person to run up long hill side as :

$P=\dfrac{E}{t}$

$P=\dfrac{mgh}{t}$

$P=\dfrac{55.8\times 9.8\times 5.07}{3}$

P = 924.15 watts

So, the minimum average power output necessary for a person to run up is 924.15 watts. Hence, this is the required solution.

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3 years ago

Jeremy has a handful of resistors. All of them, except one, have four bands. The exception has three. Why? A. He should use anot

Art [367]

Answer: option B: The resistor has a tolerance of 20%.

Explanation:

Resistors are color coded to identify their value and function. For a 3- Band resistor, reading from the left, first band denotes first digit, second band depicts second digit and third color depicts the multiplier. The absence of fourth band means the resistor has tolerance 20%.

Hence, the correct answer is option B. The resistor has a tolerance of 20%.

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love history [14]

Heat energy is a form of kinetic energy

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