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?

Part B: If the focal length of the concave lens is -7.50 cm , at what distance dofrom the lens should an object be placed so that its image is formed 3.70 cm 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? Closer, farther, to the focal point, or closer to the lens than the focal point.

Explanation / Answer

here,

PART A :
Answer will be A and C

as a concave lens always forms an image that is on the same side of the lens as the object

PART B :

1/f = 1/di + 1/do
-1/7.5 - 1/3.7 = 1do
do = 7.30 cm

PART C :
magnification = - di/do
m = 3.7/7.30
m = 0.507

Part D:
The object should be moved closer to the lens

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