Sunlight is incident on a concave mirror parallel to its principal axis. The image of the sun is formed 15 cm from the pole. Calculate the radius of curvature of the mirror.

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Solution

The rays parallel to the principal axis pass through the focus after reflection. Therefore, an image of the mirror, f = 15 cm.

Radius of curvature, r = 2f = 2 $\times$ 15 = 30 cm

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Sunlight is incident on a concave mirror parallel to its principal axis. The image of the sun is formed 15 cm from the pole. Calculate the radius of curvature of the mirror.

The rays parallel to the principal axis pass through the focus after reflection. Therefore, an image of the mirror, f = 15 cm. Radius of curvature, r = 2f = 2 × 15 = 30 cm

The rays parallel to the principal axis pass through the focus after reflection. Therefore, an image of the mirror, f = 15 cm.

Radius of curvature, r = 2f = 2 $\times$ 15 = 30 cm