Question

a glass sphere of radius 1m and refractive index 3/2 is silvered at its back . a point object is kept at a distance of 1 m from the front face ,as shown in figure . find the position of the final image​

Answer 1

Answer:

It will act like the concave mirror

where u =1m  and focal length = 0.5m

using mirror formula

1v+1u=1f1v+11=10.51v=10.5−11v=2−1=1mv=1m

Explanation:

Answer 2

Image is formed at 1m.

Explanation:

When the glass sphere is silvered from one side then it becomes a reflecting surface from the other side acting as a spherical mirror (concave or convex depending upon whether the hollow surface is polished or the bulged surface).

For spherical mirrors the distance from the geometric center of the spherical glass and the pole is called center of curvature and the focus lies at the midway of this distance.

Here, given that the object is placed at 1 meter which is the center of curvature and for any spherical mirror when the object is placed at center of curvature then the image is also formed at center of curvature but inverted in orientation.

• In case of concave mirror the image is real while it is virtual in case of a convex mirror.

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TOPICS: spherical mirrors

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