how can we conclude that when object is placed at focus, it's inverted image will be formed why not erect image?

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Solution

This is different for different lens or mirror.
IF object is placed at the focus and rays meets below the principal axis, then we get real and inverted rays.

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how can we conclude that when object is placed at focus, it's inverted image will be formed why not erect image?

This is different for different lens or mirror. IF object is placed at the focus and rays meets below the principal axis, then we get real and inverted rays.

This is different for different lens or mirror.
IF object is placed at the focus and rays meets below the principal axis, then we get real and inverted rays.