Question

Determine the focal length of a concave mirror by two-tin method

उत्तल लेंस की सहायता से एक उत्तल दर्पण की फोकस दूरी ज्ञात करें।​

Answer 1

Answer:

A concave mirror, a mirror holder, a white screen fixed on a stand or a white wall, an object (candle) and a metre scale.

Fix the given concave mirror on the stand and place it on a table, facing towards a distant object. Arrange the screen on the table so that the image of the distant object is obtained on it. Measure the distance between mirror and screen using a metre scale. It can be taken as the focal length (f) of the mirror.

f, the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. ... A negative m means that the image is inverted. Positive means an upright image.

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