Question

what do you infer from the experiment with concave mirrors on measuring distances of object and images?

Answer 1

I infer that, to find the focal length of the concave mirror, 1/f = 1/v + 1/u

Answer 2

Let's take a concave mirror of focal length ,f and a candle in front of concave mirror.

now, we observe following information from the experiment with concave mirror on measuring distance of object and images.

1. when candle is placed so far from concave mirror[ assume candle is placed at infinity ]
then, image is formed at focus ,F of concave mirror which is real and point sized.

2. when candle is placed beyond centre of curvature of concave mirror then, image is formed between focus and centre of curvature of concave mirror which is real and small sized.

3. when candle is placed at centre of curvature, C , image is formed at C which is real and same as that of object.

4. when candle is placed between C and F , image is formed behind C which is enlarged, real and inverted.

5. when candle is placed at focus , F of concave mirror, image is formed at infinity which is highly enlarged , real and inverted.

6. when candle is placed between focus and pole of concave mirror, image is formed behind the mirror which is enlarged , virtual and erect.