Spherical Mirrors: A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A. 20 cm
B. 15 cm
C. 7.5 cm
D. 5.0 cm
Answer: B
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Intensity: Light from a laser forms a 1.31-mm diameter spot on a wall. If the light intensity in the spot is 1.58 × 104 W/m2, what is the power output of the laser? Assume that all the light emitted by the laser hits the spot.
A. 21.3 mW B. 13.2 mW C. 17.9 mW D. 24.7 mW
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Indicate whether the statement is true or false
Explain why freezing rain is more commonly associated with warm fronts than with cold fronts
What will be an ideal response?
The eye focuses by
A. moving the lens. B. moving the retina. C. moving both the lens and the retina. D. changing the focal length of the lens. E. changing the index of refraction of the vitreous fluid.