A point object forms a real, enlarged image, in front of a concave mirror of curvature radius 40 cm. If the distance between the object and the image be 30 cm, what will be the object distance?

10 cm

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30 cm

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40 cm

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60 cm

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Solution

The correct option is B
30 cm

Use mirror formula $\frac{1}{f}$ = $\frac{1}{v}$ + $\frac{1}{u}$

Take v = - (u + 30), f = - 20 and object distance = -u, you will get

u = 30 cm

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A point object forms a real, enlarged image, in front of a concave mirror of curvature radius 40 cm. If the distance between the object and the image be 30 cm, what will be the object distance?

The correct option is B 30 cm Use mirror formula 1f = 1v + 1u Take v = - (u + 30), f = - 20 and object distance = -u, you will get u = 30 cm

The correct option is B
30 cm

Use mirror formula $\frac{1}{f}$ = $\frac{1}{v}$ + $\frac{1}{u}$

Take v = - (u + 30), f = - 20 and object distance = -u, you will get

u = 30 cm