Question

An object is placed on the principal axis at a distance of 8cm in front of a concave mirror of focal length 3cm. Draw ray diagram to find the image. Write the characteristics of the image formed​

Answer 1

the above is the diagram and characteristics of image

Answer 2

Given that,

Object distance, u = -8 cm

Focal length of the concave mirror, f = -3 cm

To find,

The position of image and characteristics of the image formed​.

Solution,

Using mirror's formula as :

$\dfrac{1}{v}+\dfrac{1}{u}=\dfrac{1}{f}\\\\\dfrac{1}{v}=\dfrac{1}{f}-\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{(-3)}-\dfrac{1}{(-8)}\\\\v=-4.8\ cm$

Using magnification of mirror as :

$m=\dfrac{-v}{u}\\\\m=\dfrac{-(-4.8)}{-8}\\\\m=-0.6$

The magnification shows that the formed image is real, inverted and diminished.

Learn more,

Lens formula

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