Showing reviews only for products which are assigned to selected category

I have sub category which display all products assigned to it. I want to show all reviews which are belongs to only products in the selected category.

Example: when I open Sub category will show 2 products ( which are assigned to it ) then from table reviews I want to select all reviews for this products only

So far I have sub category and products. Now I'm wondering how to select those products reviews.

This is what I have in Sub category model for relation with products

public function products()
{
   return $this->hasMany('App\Product', 'dual_sub_cat_id');
} 

this is the function in my controller

public function showSubProducts($subcatId)
{

    $dual = DualSubCategories::where('sub_cat_id', $subcatId)->with('products')->get();

    return View::make('subcategory', [
        'dual' => $dual
    ]);
}

In table reviews I have column for product_id

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