Help please. A concave lens refracts parallel rays in such a way that they are b

Question

Help please.

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) If the focal length of the concave lens is -7.50 cm , at what distance d_o from the lens should an object be placed so that its image is formed 3.70 cm from the lens? What is the magnification m produced by the concave lens described in Part B?

Explanation / Answer

We know that using the lens equation we get

1/do+1/di =1/f

1/do =1/f-1/di =1/-7.50 -1/(-3.70cm)

1/do =1/-7.50+1/3.70

1/do=-0.1333+0.2702

Then do =7.30cm

b)

The magnification produced by the concave lens is

m =-di/do

   =-(-3.70cm)/7.30cm =0.5

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