Got a brutal homework assignment this week and no idea where I\'m even going wit

Question

Got a brutal homework assignment this week and no idea where I'm even going with it. Can anyone help please???

The plano-convex lens shown has a focal length/in air. An object is placed a distance 3f from this lens. Draw an accurate ray diagram to locate the image of the object. State whether the image is real or virtual. In terms off determine the distance from the lens to the image. Determine the magnification of this image (ratio of image size to object size). The object, initially at a distance 3/from the lens, is moved toward the lens. On your paper, reproduce the axes shown to the right, and graph the image distance as the object distance varies from 3/to zero. State whether the focal length of the lens would increase, decrease, or remain the same if the index of refraction of the lens were increased. Explain your reasoning.

Explanation / Answer

b)real


c) 1/S + 1/S' = 1/f

S' = fS/(S-f)

1/3f + 1/S' = 1/f

S' = (3/2)f

d) m = S'/S = (3f/2) / 3f = 1/2

e) S = 2f

S' = 2f

f) S = f

S' = infinity

f) 1/f = (n-1)*(1/R)

f = R/(n-1)

n increases then f decreases

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