An image is the source of all light rays. An image is a location where light ray

Question

An image is the source of all light rays. An image is a location where light rays from an object (passing through the optical system) cross or appear to cross. An image is the light inside the lens. An image is the reconstruction of an object by your brain. You want to build a search light. The search light is to have an outgoing parallel beam. You have a small, very bright light (a point light source) and a concave mirror with radius of curvature 2m. How far from the mirror should the point light source be placed so the mirror produces an outgoing parallel beam The point light source should be placed infinitely far from the mirror. 1m 2m 4mMultiple-Choice Homework Problem 15.3 You can purchase a large concave mirror off the internet for $180. The mirror has a focal length of 21in. What is the radius of curvature of their mirror 0 llin. 21in. 32in. 42in. ooin. Multiple-Choice Homework Problem 15.4 A convex mirror has a radius of curvature of magnitude |r| = 50cm. An object is 20cm from the mirror. Compute the image distance. -14cm -33cm -11cm -100cm

Explanation / Answer

15.1 )   b

image is formed by refraced or reflected rays .these rays meet or appear to meet at a point where the image is formed

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15.2) (b)

the reflected light rays are parallel

image distance = s' = infinity

1/s + 1/s' = 2/R

1/s + 1/infinity = 2/2

s = 1

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15.3) (e)

radius of curvature = R = 2f = 2*21 = 42 in

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15.4) (c)

1/s + 1/s' = 1/f

1/20 + 1/s' = -2/50

image distnace = s' = -11 cm

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