# Physics Exam III HW

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When you look at an object in a mirror, the image is ____
At the surface of the mirror In front of the mirror *behind the mirror*
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When an object is like a tree is illuminated by the sun, and you are looking toward the tree, light rays leave the object _____
only from points at the top and base of the tree, but in every direction from every point on the surface of the tree, but only toward your eyes only from points at the top and base of the tree, but only toward your eyes *from every point on the surface of the tree, and in every direction*
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The image seen in a plane mirror is located ___
*behind the mirror* in front of the mirror at the surface of the mirror at the position of the object
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A light ray can change direction when going from one material into another. That phenomenon is known as _____
absorption scattering *refraction* reflection
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A ray of light impinges on a transparent material at some angle with the normal. If the material has a higher index of refraction, as it enters, the ray will ______________.
bend to make a larger angle with the normal continue going in the same direction *bend to make a smaller angle with the normal*
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When light hits the boundary between two different materials, it can undergo
Reflection. *Both reflection and refraction.* Refraction.
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What conditions are necessary for total internal reflection to occur? Choose all that apply.
*Î¸1 must be greater than Î¸c* *n2 must be less than n1* n2 must be greater than n1 Î¸1 must be less than Î¸c
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When viewing an object that is immersed in water, the image that is formed is __________.
at the same place the object is *a virtual image* farther away than the object is a real image
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A converging lens brings rays of light together at a focal point. The bending of light rays is the result of ________
Reflection of light from the front surface of the lens. *Refraction of light passing through the lens.* Diffraction of light through the small aperture of the lens. A combination of reflection and refraction.
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The shape of a converging lens is ______________.
*thicker in the center than the edges* a sphere a flat disk thinner in the center than the edges
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The shape of a diverging lens is ______________.
a sphere a flat disk thicker in the center than the edges *thinner in the center than the edges*
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What does a negative magnification indicate?
*The image is inverted.* The image is larger than the object. The image is smaller than the object. An image is not formed.
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This video describes the optics of two similar systems, ____
The magnifier and the microscope. Eyeglasses and contact lenses. The telescope and the microscope. *The camera and the eye.*
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According to the thin-lens equation, when an object is infinitely far away from a lens, where will the image form?