#9). the <em>last </em>statement is true
Calculation using Ohm's Law:
It helps a lot if you know what Ohm's Law says.
It says: Current = (voltage) / (resistance)
Current = (500 volts) / (250 ohms)
<em>Current = 2 Amperes</em>
Answer:
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Answer:
Explanation:
For image formation in objective lens
object distance u = 14 +1 = 15 mm
focal length f = 14 mm .
image distance v = ?
lens formula
Putting the values
v = 210 mm .
B )
magnification = v / u
= 210 / 15
= 14
size of image = 14 x 1.1 mm
= 15.4 mm
= 15 mm approx
C )
For final image to be at infinity , image produced by objective lens must fall at the focal point of eye piece . so objective lens's distance from the image formed by objective must be equal to focal length of eye piece that is 21 mm .
21 mm is the answer .
D )
overall magnification =
D = 25 cm , f_e = focal length of eye piece
= 14 x 250 / 21
= 166.67
= 170 ( in two significant figures )
The answer to this is: a molecule