The radius of curvature of a concave mirror is $10 c m$ . At what distance from the pole of the mirror would an image of the sun be formed?

10 cm

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5 cm

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20 cm

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Solution

The correct option is B
5 cm

If the object is placed at infinity, the image is formed at the focus.

We know the focal length is half the radius of curvature.
$f = \frac{R}{2}$ $⟹$ $f = \frac{10 c m}{2} = 5 c m$

So the image of the sun is at $5 c m$ from the pole.

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The radius of curvature of a concave mirror is 10 cm. At what distance from the pole of the mirror would an image of the sun be formed?

The correct option is B 5 cm If the object is placed at infinity, the image is formed at the focus. We know the focal length is half the radius of curvature. f=R2 ⟹ f = 10 cm2 = 5 cm So the image of the sun is at 5 cm from the pole.

The radius of curvature of a concave mirror is $10 c m$ . At what distance from the pole of the mirror would an image of the sun be formed?

The correct option is B
5 cm

If the object is placed at infinity, the image is formed at the focus.

We know the focal length is half the radius of curvature.
$f = \frac{R}{2}$ $⟹$ $f = \frac{10 c m}{2} = 5 c m$

So the image of the sun is at $5 c m$ from the pole.