A REAL IMAGE IS 1/5 THE SIZE OF OBJECT IS FORMED AT A DISTANCE OF 18CM FROM A MIRROR.CALCULATE ITS FOCAL LENGTH.
WHAT IS THE NATURE OF MIRROR
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Given: a real image is 15th 1 5 t h the size of the object, and it is formed at a distance of 18cm from the mirror. To find the focal length of the mirror and the nature of the mirror. magnification, m=−15 m = − 1 5 as the image formed is real hence it will be inverted.
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Answer:
The image is diminished and real, so it's a concave mirror.
Explanation:
Image= 18 cm which is one fifth of size of object
18 = 1/5 × u
u = 90 cm
Mirror formula: 1/v + 1/u = 1/f
1/18 + 1/90 = 1/f
5/90 + 1/90 = 1/f
6/90 = 1/f
f = 90/6
f = 15 cm
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