Express the image distance s i of a concave mirror in terms of the object distan

Question

Express the image distance si of a concave mirror in terms of the object distance so and the radius of curvature of the mirror R. Keep in mind that the focal length is positive for a convex mirror. For what range of si is the image virtual? For what range is the image real?

Express the image distance si of a concave mirror in terms of the object distance so and the radius of curvature of the mirror R. Keep in mind that the focal length is positive for a convex mirror. For what range of si is the image virtual? For what range is the image real?

Explanation / Answer

1/s0 + 1/si =-2/R

for real image :: from infinity to R/2 distance from the mirror

for virtual image : between R/2 and the mirror

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