5. If a lens has radii of curvature R = 1.1 meters and R2 = 1.2 meters and a focal length of 10 centimeters, what is the index of refraction of the lens?
5. If a lens has radii of curvature R = 1.1 meters and R2 = 1.2 meters and a focal length of 10 centimeters, what is the index of refraction of the lens?
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PHYS 2263 (Physics II)
Homework 4
1. A ray of light is shone through the interface between two media. At a depth of 5 meters below the
interface, the light ray has travelled 2 meters horizonally. If it had not been refracted, it would have
travelled 3 meters horizonally at this depth. Find the ratio . Where n is the index of refraction of
the material above the interface and na is the index of refraction of the material below the interface.
2. Draw a raytrace diagram of an object and its reflected image in a convex mirror.
3. Using the same setup as in problem 1, find the critical angle for total internal reflection between medium
2 and medium 1.
4. An object is placed twice the focal distance from a concave mirror.
(a) Find the magnification of the object.
(b) Is the image upright or inverted?
(e) Same as in part (a), except now the object is placed at half the focal distance from the mirror.
5. If a lens has radii of curvature R = 1.1 meters and R2 = 1.2 meters and a focal length of 10 centimeters,
what is the index of refraction of the lens?
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