Question

if an image is formed behind a concave mirror (to the right side)then the image distance will be negative?explain the statement​

Answer 1

When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. A negative m means that the image is inverted.

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Answer 2

Explanation:

Using mirror equation,

v

1

+

u

1

=

f

1

v

1

=

f

1

−

u

1

For concave mirror, focal length is negative. Hence, f<0

For a virtual object, object distance is positive. Hence u

v

>0

From above, it can be observed that image

distance v is negative when object is virtual. Since image distance is negative, it is formed by real intersection of rays and image is real.

For a real object, object distance is negative. Hence u

r

<0

In this case, image distance v may be positive or negative depending on the location of object.

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