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# The illumination on the screen, in case of a movie hall if the distance between theprojector and the screen are increased by $1 \%$ will be:(A) increased by $1 \%$ (B) decreased by $1 \%$ (C) increased by $2 \%$ (D) decreased by $2 \%$

Last updated date: 20th Jun 2024
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A projector is an output device that projects an image onto a large surface, such as a white screen or wall. Most projectors have multiple input sources, such as HDMI ports for newer equipment and VGA ports for older devices. A projector is an optical gadget that projects a picture or moving images onto a surface, usually a projection screen. Most projectors create a photo through projecting a bright light via a small lens. However, some newer types of projectors can project the image directly, by using the usage of lasers. Based on this we have to solve this question.

Hence, $\mathrm{E} \propto \dfrac{1}{\mathrm{r}^{2}}$
$\dfrac{\mathrm{dE}}{\mathrm{E}}=2\left(\dfrac{\Delta \mathrm{r}}{\mathrm{r}}\right)=2 \times 1 \%=2 \%$