Question

IN a movie hall, the distance between the screen and the projector is increased by 4%. Then the illumination is decreased by

Answer 1

$\huge\pink{\mathfrak{Hello!;}}$

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• $\color{red}{Decreases...by ...8percent}$

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Illumination; E = IcosΦ/r²

==>E=IcosΦ r-²

for constant I and Φ ;

==>(∆E÷E) x 100 = -2 x (∆r÷r) x 400

==>(∆E÷E) x 100 = -2 x 4 %

====> (∆E÷E) x 100 = -8%

here, $\color{blue}{negative.. sign}$ indicates that illumination will $\color{blue}{decreases}$

So, $\color{red}{decreases..by..8}$%

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Answer 2

Answer:

8%

Explanation: