Question

while determining the focal length of a concave mirror, a student obtain the image of distant tree on a screen. write the characteritics of the image

Answer 1

Objective -

To determine the focal length of a concave mirror, by obtaining image of a distant object.

Theory

A concave mirror, like a plane mirror, obeys the laws of reflection of light.

Rays of light from object - The rays of light coming from a distant object e.g. sun or a distant building can be considered to be parallel to each other.

When these parallel rays of light fall on a concave mirror along its axis, reflect and meet at a point in front of the mirror, which is called as Principal focus of the mirror.

A real, inverted and very small image size is formed at the focus of the mirror.

Focal Length - 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.

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Answer 2

Answer:

while determining the focal length of a concave mirror, a student obtain the image of distant tree on a screen. write the characteritics of the image