Question

a concave mirror is used for image formation for different position of an object what inferences can be drawn about the following when an object is placed at a distance of 10 cm from the pole of a concave mirror of focal length 15cm
a) position of image
b)size of image
c)nature of image​

Answer 1

Answer:

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Answer 2

a) $i=-30\ cm$ here negative sign means that the image is formed behind the mirror,

$(c)\ ~$ hence virtual in nature because the rays actually don't meet behind the mirror.

b) $h'=-3h$ (this means that the image is three times larger than the object but erect in position)

Explanation:

Given:

focal length of the image, $f=15\ cm$

position of the object, $o=10\ cm$

using the mirror equation;

$\frac{1}{f}=\frac{1}{o}+\frac{1}{i}$

$\frac{1}{15}=\frac{1}{10}+\frac{1}{i}$

• $i=-30\ cm$ here negative sign means that the image is formed behind the mirror, hence virtual in nature because the rays actually don't meet behind the mirror.

Now the size of the image:

$\frac{i}{o} =\frac{h'}{h}$

$\frac{-30}{10}\times h =h'$

• $h'=-3h$ (this means that the image is three times larger than the object but erect in position)

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TOPIC: concave mirror

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