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Height of the object, h = 6cm
Object dist. u = - 30 cm
Radius = 40 cm.
Focal length f = ?
Image distance v = ?
Image height h’ = ?
Focal length f = R / 2
= 40 / 2
= 20 cm
From mirror formula
1/v + 1/u = 1/f
1/v = 1/20 + 1/30
1/v = (3+2) / 60
v = 12 cm
Image is behind the mirror and the image is virtual and exact.
To find out the image height let us use magnification formula : m = h’ / h = -v / u
h’ = -v*h /u
= (-12) 6 / (-30)
= 12/ 5
= 2.4 cm (image is smaller )
The focal length ( f ) is the distance from a lens or mirror to the focal point ( F ). This is the distance from a lens or mirror at which parallel light rays will meet.
Know more about mirror formula here
https://brainly.com/question/8512677
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