If we say that a material is opaque to ultraviolet light, we mean that it
A) absorbs ultraviolet light.
B) emits ultraviolet light.
C) transmits ultraviolet light.
D) reflects ultraviolet light.
A
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The total number of stars in the observable universe is about
A) 100 billion. B) the same as the number of grains of sand in a school sandbox. C) the same as the number of grains of sand on all the beaches on Earth. D) the same as the number of atoms that make up the Earth.
A 500 nm light is reflected constructively from a thin layer of oil of index of refraction 1.25, which rests on the top of water of index of refraction 1.33. What is the minimum thickness of the layer of oil?
A) 100 nm B) 150 nm C) 175 nm D) 200 nm E) 225 nm
The Hubble Space Telescope has been repaired
a. True b. False Indicate whether the statement is true or false
You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a refracting telescope. If the magnification you obtain using lens a is Ma, what will be the magnification when using lens b?
A) Mb = 2 Ma B) Mb = 4 Ma C) Mb = 8 Ma D) Mb = Ma/4 E) Mb = Ma/2