Both a shiny metallic spoon and a plane mirror enable us to see ourselves. However, the images they form are completely different. Explain the reason behind this.
Answers
Answer:
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Explanation:
A plane mirror is a mirror with a flat (planar) reflective surface.For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.
If you stand in front of a plane mirror you see your virtual image formed at the same distance as you stand.
The light falling on you gets reflected by the mirror again. All these reflected rays are divergent rays. Hence they really do not meet. It appears to come from behind the mirror. The reflected rays appear to converge at a point behind the mirror. This image is formed by the apparent convergence of rays behind the mirror is virtual.
In case of a convex mirror or the spoon your are showing; the light reflected from your body, gets reflected from the concave surface of the mirror. These reflected rays are convergent rays. hence they really converge at point by side of the object. This image is real because it is formed by the real convergence of light ray.
In case the object that we are viewing is at a distance lesser than the focal length (which can happen with comparatively “much flatter” spoons) the image would be erect and virtual.
Why is the image inverted? This is because the concavity of the spoon is generally such that the distance from the spoon of the object that we are viewing is generally more than the focal length of the spoon. When the object is at a distance greater than the focal length the image is inverted. Such images are real images.
SUMMARY
In case of mirror reflected rays are divergent and they do not meet really, it appears to come behind the mirror; whereas in the case of concave mirror or spoon the reflected rays are convergent in front of the concave surface and they really meet to form real image.
In a spoon both real and virtual image can be formed. With the convex surface virtual image is formed. With the concave surface, virtual image is formed when the object is close by.