An object is placed at the focal point of a converging lens and the light rays from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
A. the will remain parallel to the principle axis
B. they converge toward each other
C. they emerge parallel to each other but not the principle axis
D. they diverge from each other
D. they diverge from each other
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Everything looks red through a red filter because
A) the filter emits red light and absorbs other colors. B) the filter absorbs red light and emits other colors. C) the filter transmits red light and absorbs other colors. D) the filter reflects red light and transmits other colors.
What is a gravitational lens?
A. a lens that is affected by gravity B. a massive object that bends the space around it, causing light passing it to bend C. a star that is eclipsed by one of its planets D. an extremely massive refractor telescope
A 4.0-cm-tall object is placed 50.0 cm from a diverging lens having a focal length of magnitude 25.0 cm. What is the nature and location of the image?
A) a real image, 4.0 cm tall, 20 cm other side of the object B) a virtual image, 4.0 cm tall, 20 cm other side of the object C) a virtual image, 2.0 cm tall, 10 cm other side of the object D) a virtual image, 1.3 cm tall, 16.7 cm same side as the object E) a real image, 1.3 cm tall, 16.7 cm same side as the object
The y-component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. (c = 3.0 x 108 m/s)
(a) What is the largest that the x-component of the wave can be? (b) What is the largest that the z-component of the wave can be?