A diverging lens has a focal length that has a magnitude of 37.0 cm. An object is placed 19.5 cm in front of this lens. Calculate the magnification.
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To calculate the magnification produced by a diverging lens, we can use the lens formula:
f1=do1+di1
where:f is the focal length of the lens,do is the object distance (distance of the object from the lens), anddi is the image distance (distance of the image formed by the lens).
Since the focal length of the diverging lens is negative (for a diverging lens, the focal length is always negative), we will take it as -37.0 cm.
Given thatdo=−19.5 cm (negative because the object is placed in front of the lens), we can solve fordi using the lens formula:
−371=−19.51+di1
Now, let's solve fordi:
37−1=19.5−1+di1
Multiply both sides by−37⋅19.5⋅di to eliminate the fractions:
−19.5⋅di=−37⋅di+37⋅19.5
Now, add37⋅di to both sides:
17.5⋅di=37⋅19.5
Finally, divide both sides by 17.5 to solve fordi:
di=17.537⋅19.5
Now, we have the value fordi, which is the image distance. To calculate the magnification (M) of the lens, we use the magnification formula:
M=dodi
Plugging in the values:
M=−19.517.537⋅19.5
M=−17.5⋅19.537⋅19.5
M=−17.537
M≈−2.114
The magnification produced by the diverging lens is approximately -2.114. The negative sign indicates that the image is virtual and upright (opposite orientation compared to the object). The magnitude of the magnification tells us that the image is reduced in size by a factor of approximately 2.114.
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