TIPERS E2-V NT32- SINGLE LENS-FOCAL LENGTH A student makes the followi.docx

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TIPERS E2-V NT32: SINGLE LENS-FOCAL LENGTH A student makes the following contention: \'If a single lens can onty produce images that are smaller than the objects involved, then the lens is a negative focal length lens What, if anything. s wrong with this statement? I something is wrong, identify it and explain how to corret E2-QRT33: RAYS EMERGING FROM A LENS-LENS AND IMAGE TYPE The vertical rectangle in the figure represents a thin lens. The dashed line is the optical axis of that lens. Two of the three principal light rays are shown emerging from the lens. These light rays originated at a single point on an object placed to the left of the lens. (a) What type of lens is this, and how do you know? Lens Optical axis (b) Draw the third ray that is commonly used to find the image. (c) What type of image will form here, and how do you know? E2-CT34: OBJECTS INSIDE FOCAL LENGTH OF LENSES-IMAGE DISTANCEI In the two situations shown, the lenses have the same focal lengths, and the object distance from the lens to the arrow is the same. In both cases the object distance is less than the focal distance. Will the image distance for Case A be (i) greater than, (i) less than, or (ii) equal to the image distance for Case B? Explain your reasoning, Copyright Â© 2015 Pearson Education, Inc. Solution Case A : for converging lens: f = focal length (positive) d o = object distance d i = image distance using the lens equation 1/d i + 1/d o = 1/f d i = d o f/(d o - f) for case B: for diverging lens: f = focal length (negative) d o = object distance d i = image distance using the lens equation 1/d i + 1/d o = 1/(-f) d i = - d o f/(d o + f) hence image distance in case B is smaller as the number in denominator is larger in case B .

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for diverging lens:
f = focal length (negative)
d o = object distance
d i = image distance
using the lens equation
1/d i + 1/d o = 1/(-f)
d i = - d o f/(d o + f)
hence image distance in case B is smaller as the number in denominator is larger in case B

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