A far sighted person can not see clearly objects that are closer to his eyes than 60.0 cm
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the objects at a distance of 25.0 cm from his eyes? A) -42.9 cm, +2.33 diopters
B) -42.9 cm, -2.33 diopters
C) +42.9 cm, +2.33 diopters
D) +42.9 cm, -2.33 diopters
E) +60 cm, +42.9 diopters
C
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A convex lens has focal length f. If an object is located at "infinity" (very far away), the image formed is located at a distance from the lens
A) of 2f. B) between f and 2f. C) of f. D) between the lens and f. E) of infinity.
Volcanic eruptions may affect climate because volcanoes release sulfur compounds and small particles into the stratosphere
What will be an ideal response?
Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Both balls hit the ground at
A) different speeds. B) the same speed in the same time. C) the same speed in different times. D) none of the above
Camera Exposure: The focal length of a camera lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A. 4.0 B. 2.0 C. 5.6 D. 0.25 E. 0.40