A double-concave lens has equal radii of curvature of 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 5.29 cm from the lens. What is the index of refraction of the lens material?
A) 1.90
B) 1.98
C) 1.82
D) 1.77
A
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The appearance of _________coalescence on the fracture surface indicates a ductile metal with high energy absorption.
Fill in the blank(s) with the appropriate word(s).
One possible ingredient of dark matter is known as WIMPs, or weakly interacting massive particles. Our best guess is that WIMPs probably are made of protons and neutrons
Indicate whether the statement is true or false
If we could put all the asteroids together, their total mass would be
A) much less than the mass of any terrestrial planet. B) about the mass of Mercury. C) about the mass of Earth. D) greater than the mass of Earth but less than the mass of Jupiter.
In addition to the conditions required for any solar eclipse, what must also be true in order for you to observe a total solar eclipse?
A) Earth must lie completely within the Moon's full shadow (umbra). B) Earth must lie completely within the Moon's partial shadow (penumbra). C) Earth must be near aphelion in its orbit of the Sun. D) The Moon's full shadow (umbra) must touch the area where you are located. E) The Moon's partial shadow (penumbra) must touch the area where you are located.