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, then the object distance will be 30 cm.

10 cm

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30 cm

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Solution

The correct option is A
10 cm

Using 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, then the object distance will be 30 cm.

The correct option is A 10 cm Using 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 A
10 cm

Using 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