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3 years ago

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a certain projetor uses a concave mirror for projecting an object's image on a screen .it produces on image that is 4 times bigg

er than the object and the screen is 5 m away from the mirror as shown in fig 5.2, calculate the focal length of the mirror.

1 answer:

IrinaK [193]3 years ago

6 0

Answer:

f = 1 m

Explanation:

The magnification of the lens is given by the formula:

$M = \frac{q}{p}$

where,

M = Magnification = 4

q = image distance = 5 m

p = object distance = ?

Therefore,

$4 = \frac{5\ m}{p}\\\\p = \frac{5\ m}{4}\\\\p = 1.25\ m$

Now using thin lens formula:

$\frac{1}{f}=\frac{1}{p}+\frac{1}{q}\\\\\frac{1}{f} = \frac{1}{1.25\ m}+\frac{1}{5\ m}\\\\\frac{1}{f} = 1\ m^{-1}\\\\$

<u>f = 1 m</u>

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