A point object is placed on the principal axis of a spherical mirror. ...
Option ( a) is the correct answer. As the object is always placed on the left side of the mirror and according to the sign convention, it has negative value for 'so axis.
Therefore, spherical mirrors have only one reflecting surface and it will be negative only.
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A point object is placed on the principal axis of a spherical mirror. ...
The correct answer is option 'A', which means that the object-distance u is definitely negative in the given scenario.
Explanation:
Spherical mirrors are curved mirrors that have a spherical shape. They are of two types - concave and convex mirrors. A concave mirror is also called a converging mirror because it converges the reflected rays towards a point on its principal axis, whereas a convex mirror is called a diverging mirror because it diverges the reflected rays away from a point on its principal axis.
In the given scenario, a point object is placed on the principal axis of a spherical mirror. This means that the object is placed at a certain distance from the mirror, which is called the object-distance (u). The object-distance is measured as the distance between the object and the pole of the mirror.
Now, the question is asking about the sign of the object-distance (u) in this scenario. The sign of the object-distance depends on the position of the object with respect to the mirror.
If the object is placed on the same side of the mirror as the incident light, then the object-distance is considered positive. If the object is placed on the opposite side of the mirror as the incident light, then the object-distance is considered negative.
In the given scenario, the object is placed on the principal axis of the mirror, which means that it is equidistant from the pole and the centre of curvature. Therefore, the position of the object with respect to the mirror cannot be determined. It could be on either side of the mirror.
However, the question is asking for the definite sign of the object-distance. Since the object is placed on the principal axis of the mirror, it is not possible for the object-distance to be positive. This is because the incident light rays are always converging towards the focal point, which is located on the opposite side of the mirror as the incident light. Therefore, the object-distance must be negative in this scenario.
Hence, the correct answer is option 'A', which states that the object-distance u is definitely negative in the given scenario.
A point object is placed on the principal axis of a spherical mirror. ...
A. is right answer because in spherical mirror object place always in left side so it definitely negative
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