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Sagot :
- Object distance=u=14cm
- Image distance=v=-10cm
Use lens formula
- 1/f=1/v-1/u
- 1/f=1/-10-1/14
- 1/f=-7-5/70
- 1/f=-12/70
- f=70/-12
- f=-5.8cm
The focal length of the lens is 5.8 cm.
To find the focal length, the given values are:
Image distance - 10 cm
Object distance - 14 cm
What is focal length and how it was calculated?
The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length. This is the parallel line which meet at the distance from the lens or mirror.
1/Focal length = 1/Image distance + 1/Object distance ( cm )
1/f = 1/v-1/u
1/f = 1/-10-1/14
1/f = -7-5/70
1/f = -12/70
f = 70/-12
f = -5.8cm
The focal length of the lens is - 5.8 cm.
Learn more about Focal length,
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