A concave lens refracts parallel rays in such a way that they are bent away from

Question

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.

Part A: 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)

Part B: If the focal length of the concave lens is -7.50cm , at what distance do from the lens should an object be placed so that its image is formed 3.70cm from the lens?

Part C: What is the magnification m produced by the concave lens described in Part B?

Part D: Where should the object be moved to have a larger magnification?

Explanation / Answer

Part A: A & C

Part B: (1/f) = (1/v) - (1/u)
u = -7.30 cm
Object Distance = 7.30 cm

Part C: Magnification = (-3.70)/(-7.3) = +0.51

Part D: Towards the lens

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