Homomorphisms of matrix Lie groups

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Are there two matrix Lie groups $G$, $H$, i.e. closed subgroups of $\text{GL}(n,\mathbb{R})$ or $\text{GL}(n,\mathbb{C})$, and a smooth group homomorphism $f:G\rightarrow H$, such that $f(G)$ ist not a closed subgroup in $H$?