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Arisa [49]
3 years ago
14

A light-year is the distance that light can travel in one year. If the sun is 1.5 x 10⁸ km away, how many light years is the sun

from earth? Assume that light travels at a speed of 3.0 x 10¹⁰ cm/s.​
Physics
1 answer:
photoshop1234 [79]3 years ago
3 0

Answer:

0.00001581 light years

Explanation:

distance divided by speed of light= 150,000,000/300,000= 500 seconds 8.3333

8.3 minutes

now divide this by 60 x 24 x 365.25. so you will get answer=  

.000015823 light years.

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Answer:

The focal length of the lens is -5.88 cm.

Explanation:

We know that magnification in case of lenses is given by

m=\frac{v}{u}

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'v' is the position of image

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Since it is given that m = 0.4 thus we can write

\frac{v}{u}=0.4\\\\\therefore v=0.4u

Now the distance between the object and the image in case of concave lens is given by

u-v =5.3\\\\u-0.4u=5.3\\\\\therefore u=\frac{5.3}{(1-0.4)}=8.84cm\\\\v=0.4\times 8.84=3.54cm

Now by lens formula the focal length of the lens is given by

\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\\\\\frac{1}{f}=\frac{1}{-3.54}-\frac{1}{-8.84}\\\\\therefore f=-5.88cm

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