Question

6) Concave mirror Radius is 26Em then its focal length is _cm​

Answer 1

Answer:

Radius of curvature = 2 x focal length.

So, focal length =

2

1

× radius of curvature =

2

1

×20 cm = 10 cm......

please mark as brainliest......

Answer 2

10 cm

✒ For a concave mirror, image size is same as the object size when it is placed at the center of curvature. Since radius of the mirror is twice the focal length, center of curvature lies at a distance of 30 cm from the pole. Hence, an object kept at 30 cm will produce an image of the same size as that of the object.

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