Question

A candle 4 cm in size is placed at a distance of 25 cm from a concave mirror of focal length 15 cm. what will the size and position of the image ?

Answer 1

Answer:

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Answer 2

u = -25

f = - 15

so, by the mirror formula

$frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} = \frac{1}{-15} + \frac{1}{25}$

$\frac{1}{v} = \frac{-5 + 3}{75}$

$\frac{1}{v} = \frac{-2}{75}$

so by the other formula

$\frac{h_e}{h_o} = -\frac{v}{u}$

$\frac{h_e}{4} = - \frac{\frac{-75}{2}}{-25}$

$h_e = -6$