A cell phone is placed 40 cm in front of a convex lens with a focal length of magnitude 20 cm. How far is the image of this phone from the lens?
A) 40 cm
B) 20 cm
C) 13 cm
D) 60 cm
E) 10 cm
A
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The type of mineral formed is determined by
A) crystallization. B) the elements present and the conditions that lead to formation. C) silica content. D) chemical bonding.
A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
A) 50 cm B) 20 cm C) 15 cm D) 7.5 cm E) 5.0 cm
A microscope has an objective lens with an aperture diameter 0.60 cm. A monochromatic light source of wavelength 580 nm is used to illuminate the object. It is determined that the minimum angle of resolution is 1.18 × 10^-4 rad. If the present lens were replaced by one with an aperture of diameter 1.0 cm, what would the minimum angle of resolution now become? (1 nm = 10-9 m)
a. 1.5 × 10^-4 rad c. 0.71 × 10^-4 rad b. 0.79 × 10^-4 rad d. 1.8 × 10^-4 rad
Each second, the burning Sun's mass
A) decreases. B) increases. C) remains unchanged.