Question

an object 3 centimetre high is placed at a distance of 10cm in front of a concave mirror of focal length 20 cm find the position nature and size of the image form​

Answer 1

$\huge\underline\purple{\sf Answer:-}$

★Given :-

Height of object = 3 cm

Distance = 10cm

focal length = 20 cm

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

$\large{\sf {\frac{1}{v}}=-{\frac{1}{20}}-{\frac{-1}{10}}}$

$\large\red{\boxed{\sf v =20cm}}$

$\large{\boxed{\sf {\frac{-v}{u}}={\frac{h_{i}}{h_{o}}}}}$

$\large{\sf {\frac{-20}{-10}}={\frac{h_{i}}{3}}}$

$\large{\sf h_{i}=2×3}$

$\large\red{\boxed{\sf h_{i}=6cm}}$