At the time of the vernal equinox
a) the Sun is above the equator moving southward.
b) the number of hours of daylight exceeds the number of hours of darkness.
c) summer begins for the Northern Hemisphere.
d) the Sun is above the equator moving northward.
d
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To make an uncharged object have a positive charge:
A. remove some neutrons B. add some neutrons C. add some electrons D. remove some electrons E. heat it to cause a change of phase
Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is
A) definitely less. B) often less. C) actually more. D) the same. E) incredibly, all of the above
An ideal Polaroid will transmit 50% of nonpolarized incident light. How much light is transmitted by two ideal Polaroids oriented with their axes parallel to each other?
A) 0% B) 50% C) 100% D) between 0% and 50% E) between 50% and 100%
Lens-Maker Formula: As part of a piece of optical apparatus to be used in air, you need to design a thin lens having faces with radii of curvature of magnitude 24 cm each. When an object 32 mm tall is placed 30 cm from this lens, it must form a real image 60 cm from the lens.(a) What must be the index of refraction of the lens material?(b) What is the height of the image of the object? Is it upright or inverted; is it real or virtual?
What will be an ideal response?