Question

To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always:

Answer 1

Answer:

Explanation:

The image obtained on the screen as compared to the object is always real, inverted and highly diminished as concave mirror forms an image of an object located at infinity on the principle focus. From the infinity source the rays of light always travel parallel to the principle axis and meet at the principle focus forming a highly diminished image.

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Answer 2

The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.