Explanation
Correct answer is (a) Sir Issac Newton.
In 1666, during one of his optical experiments, Newton passed a beam of sunlight through a glass prism. The glass prism split the light into a band of seven colours on his wall. This phenomena is known as dispersion of light
He called this band of colours the ‘spectrum’. Thus the spectrum is a band of seven colours which is obtained by splitting of white light by a glass prism.
$$\textbf{Explanation:}$$
$$\bullet$$ From the mirror formula $$\dfrac{1}{u}+\dfrac{1}{v}=\dfrac{1}{f}$$; for a plane mirror R = $$\infty $$, hence f = $$\infty $$. Therefore, $$\dfrac{1}{f}=0$$
$$\bullet$$ The formula becomes $$\dfrac{1}{u}+\dfrac{1}{v}=0\text{ or }\dfrac{1}{u}=-\dfrac{1}{v}\text{ or -}u=v$$
$$\bullet$$Thus, the image formed by a plane mirror is always virtual, inverted laterally, and erect.
$$\bullet$$It has a characteristic magnification of unity ($$\because \dfrac{v}{u}=1$$); hence the image is of the same size as that of the object.
$$\textit{Answer:}$$
$$\textbf{Hence, the correct option is (D) all of the above}$$
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