Question

- An object is placed at
a distance
of 10cm from concave mirror of
Focal length 20cm. Find the
Find the distance
of image
​

Answer 1

Answer:

5cm

Explanation:

it should be 5cm I am sure

Answer 2

Aɴsᴡᴇʀ:

• The distance of image = 20 cm

Gɪᴠᴇɴ:

• An object is placed at a distance of 10cm from concave mirror of Focal length 20cm.

Nᴇᴇᴅ Tᴏ Fɪɴᴅ:

• The distance of image = ?

Solution:

Bʏ ᴜsɪɴɢ ᴍɪʀʀᴏʀ ғᴏʀᴍᴜʟᴀ:

• ${\underline{\boxed{\sf{\dfrac{1}{v} + \dfrac{1}{u} + \dfrac{1}{f}}}}}$

• ${\underline{\boxed{\sf{\dfrac{1}{v} = \dfrac{1}{f} - \dfrac{1}{u}}}}}$

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Pᴜᴛᴛɪɴɢ ᴛʜᴇ ᴠᴀʟᴜᴇs:

$\longrightarrow \sf {\dfrac{1}{v} = \dfrac{-1}{20} - \dfrac{-1}{10}}$

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$\longrightarrow \sf {\dfrac{1}{v} = \dfrac{-1}{20} + \dfrac{1}{10}}$

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$\longrightarrow \sf {\dfrac{1}{v} = \dfrac{-1 + 2}{20}}$

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

$\longrightarrow \sf {\dfrac{1}{v} = \dfrac{1}{20}}$

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

$\longrightarrow \boxed{\sf{\purple{v = 20\:cm}}}$

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Tʜᴇʀᴇғᴏʀᴇ:

• The distance of image = 20 cm

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