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3. Calculate the powers of the following two lenses:

(a) focal length 2 m .........................................................

(b) focal length 10 cm .........................................................

3. A star A has a parallax of 0.20" and a star B has a parallax of 0.25". Which star is further
from the Earth?

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4. A…

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(b) what is 290 K in oC? .......................................

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