The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity
The near point of the microscope user is at 25 cm. What is the distance between the object and the focal point of the objective lens? A) 0.13 mm
B) 0.18 mm
C) 0.23 mm
D) 0.28 mm
E) 0.33 mm
A
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The cockroach doubling time is about 1 week. After 6 weeks of reproducing, how many cockroaches will there be stemming from an original pair?
a. 10 b. 32 c. 64 d. 128 e. 256
If a solar eclipse occurs when the Moon is relatively far from Earth, so that its full shadow (umbra) does not reach Earth, then people directly behind the full shadow will experience
A) a penumbral eclipse. B) a total solar eclipse. C) a partial solar eclipse. D) an annular eclipse. E) no eclipse.
A 1.5-m tall woman stands 5.0 m in front of a camera with a 8.0 cm focal length lens. What is the size of the image formed on film?
a. 2.4 cm c. 1.9 cm b. 0.60 cm d. 1.2 cm
When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation. b. can be decreased by shifting mass out away from the axis of rotation. c. can be increased by shifting mass in toward the axis of rotation. d. can be decreased by shifting mass in toward the axis of rotation. e. cannot be changed except by friction at the point of contact.