An object is placed 18cm iin fromt of speherical mirror. If the image is formed at 4cm to the right of the mirror , calculate the focal length of the mirror.Is the mirror concave or convex , what is the nature of the image and its radius of curvature.

Asked by  | 15th Dec, 2012, 11:52: AM

Expert Answer:

since the image is formed to the right of the mirror, i.e. it is formed at the backside of the mirror.
Hence it is virtual.
object position, u = -18
image position, v = +4
let focal length be, f
using the mirror equation:
1/v + 1/u = 1/f
thus we can get the value for f
if it is positive, the mirror is convex else it is convex

Answered by  | 15th Dec, 2012, 02:45: PM

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