A contact lens is made of plastic with an index of refraction 1.50 . The lens has an outer radius of curvature of + 1.65 cm and an inner radius of curvature of + 5.85 cm. What is its focal length?
a. –4.60 cm
b. +1.53 cm
c. +2.57 cm
d. +4.60 cm
e. –2.57 cm
d
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___________ are produced when two galaxies pass near each other and pull large streamers of stars, gas, and dust away from the galaxies
a. Ring galaxies b. Spiral galaxies c. Rotation curves d. Tidal tails e. Irregular galaxies
If a lens is submerged in water, what happens to its focal length?
A) It decreases. B) It stays the same. C) It becomes negative. D) It increases.
Earthquake S waves are
a. transverse. b. sometimes longitudinal and sometimes transverse. c. longitudinal. d. neither longitudinal nor transverse.
A convex mirror with focal length of -20 cm forms an image 15 cm behind the surface. Where is the object located as measured from the surface?
a. 30 cm c. 15 cm b. 7.5 cm d. 60 cm