The chromatic aberration in lenses is due to the
A) reflection of light by the lens.
B) refraction of light by the lens.
C) dispersion of light by the lens.
D) polarization of light by the lens.
E) None of the other choices is correct.
C
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Spherical Mirrors: If a spherical concave mirror has a radius of curvature R, its focal length is
A. R/4. B. R/2. C. R. D. 2R. E. 4R.
A steel bracket ABC (EI 5 4.2 3 106 N?m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum rotation of joint B is approximately:
(A) 0.18
(B) 0.38
(C) 0.68
(D) 0.98
When air resistance is a factor, maximum range is achieved when the projection angle is
A) less than 45.° B) 45.° C) greater than 45.° but not 90.° D) 90.°
When an object of mass m is pushed to relativistic speed v, its momentum is
A) greater than mv. B) smaller than mv. C) equal to mv.