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[" 3.A concave mirror has a focal length...

[" 3.A concave mirror has a focal length of "20cm" .Find the position or positions of "],[" an object for which the image is double of the object size."]

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A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.

A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.

A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.

A concave mirror has a focal length 20 cm. The distance between the two positions of the object for which the image size is double of the object size is

A concave mirror has a focal length 20 cm. The distance between the two positions of the object for which the image size is double of the object size is