Question

an object is placed at a distance of 40 cm in front of concave mirror of focal length 20cm list four characteristics of the image formed by the mirror.​

Answer 1

Answer:

Explanation: characteristics of image is 1) position of object is on centre of curvature 2) position of image is on centre of curvature 3) image is same size and inverted4) real

Hope it helps you

Answer 2

$\huge\underline\blue{\sf Solution:}$

$\large\underline\pink{\sf Given: }$

• Distance of object (u) = 40cm

• Focal lenght (f) = 20cm

$\large\underline\pink{\sf To\:Find: }$

• Characteristics of image .

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According to mirror formula :

$\large{\boxed{\sf {\frac{1}{f}}={\frac{1}{u}}+{\frac{1}{v}}}}$

On Putting the given value :

Since object and focal Lenght is at left side of the pole therefore it is take as negative (-)

$\large\implies{\sf {\frac{1}{-20}}={\frac{1}{-40}}+{\frac{1}{v}}}$

$\large\implies{\sf {\frac{1}{v}}={\frac{1}{-20}}+{\frac{1}{40}} }$

$\large\implies{\sf {\frac{1}{v}}={\frac{40+(-20)}{-20×40}}}$

$\large\implies{\sf v={\frac{-800}{20}}}$

$\large\red{\boxed{\sf v=-40cm }}$

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Characteristics of formed image :

• As we can see in the given diagram image is formed at Centre of Curvature.

• Size of image is equal to the side of object .

• Image formed is real and inverted

• Magnification of image is negative (-)