An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. The final image
A)
is real and upright.
B)
is virtual and upright.
C)
is real and inverted.
D)
is virtual and inverted.
E)
cannot be determined with the information given.
C
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Based on current scientific evidence, what is the likelihood that life on Earth formed spontaneously from increasingly complex chemical reactions?
A) very likely B) certain C) impossible D) very unlikely
The cosmic microwave background radiation comes from the time when neutral hydrogen atoms formed in the process of _______________
Fill in the blank(s) with correct word
A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?
A) 25 cm behind the mirror B) 20 cm behind the mirror C) 20 cm in front of the mirror D) 25 cm in front of the mirror E) 100 cm in front of the mirror
When used in a single instrument to greatly enhance its resolution, the four separate mirrors of the VLT act as a(n) ________
Fill in the blank(s) with correct word