Ray Tracing and Image Formation with a Concave Lens 10 of 15 Part A Constants A

Question

Ray Tracing and Image Formation with a Concave Lens 10 of 15 Part A Constants A concave lens refracts parallel rays in such a way that they are bent away from the axis of the lens. For this reason, a concave lens is referred to as a diverging lens. Consider the following diagrams, where F represents the focal point of a concave lens. In these diagrams, the image formed by the lens is obtained using the ray tracing technique. Which diagrams are accurate?(Figure 1) (Figure 2) (Figure 3) (Figure 4) Type A if you think that only diagram A is correct, type AB if you think that only diagrams A and B are correct, and so on. View Available Hint(s) Submit Figure 1 of4> Part B If the focal length of the concave lens is -7.50 cm, at what distance do from the lens should an object be placed so that its image is formed 3.70 cm from the lens? Concave lens Express your answer in centimeters. View Available Hint(s) Image cm

Explanation / Answer

A) Images are not visible

B)

from lens law

1/v + 1/u = 1/f

The image is forming on the same object side, so the image distance should be in negative.

f = -7.50 cm

u = -3.70 cm

1/v - 1/3.70 = 1/-7.50

1/v = -1/7.50 + 1/3.70

v = 7.30 cm

c)

m = -u/v

m = -(-3.70) / 7.30

m = 0.507

d)

The object should be moved closer to the lens to have larger magnification.

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