Question

You are trying to photograph a bird sitting on a tree branch,but a tall hedge is blocking your view. However, as the drawingshows, a plane mirror refl

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You are trying to photograph a bird sitting on a tree branch,but a tall hedge is blocking your view. However, as the drawingshows, a plane mirror reflects light from the bird into yourcamera. If x = 3.4 m and y = 4.4 m in the drawing, forwhat distance must you set the focus of the camera lens in order tosnap a sharp picture of the bird's image?

2020-11-02

From the figure, to get a sharp image of the bird, we haveto find the hypotunese of the right angled triangel ABC
$$\displaystyle{B}{C}={\left({A}{B}^{{{2}}}+{B}{C}^{{{2}}}\right)}$$
$$\displaystyle={4.4}^{{{2}}}$$
$$\displaystyle+{\left({3.4}+{2.1}\right)}^{{{2}}}$$
simplify and calculate the value of BC.