Question

If radius of curvature is 20cm find the focal length of concave mirror​.​

Answer 1

Answer:

focal length is half of radius of curvature so gere focal length is 10 cm

Answer 2

Aɴsᴡᴇʀ:

• The focal length of concave mirror = 10 Cm

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Gɪven:

• The radius of curvature is 20cm.

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Nᴇᴇᴅ Tᴏ Fɪɴᴅ:

• The focal length of concave mirror = ?

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Solution:

Fᴏʀᴍᴜʟᴀ ᴜsᴇᴅ ʜᴇʀᴇ:

• ${\underline{\boxed{\sf{Focal \: length = \dfrac{Radius\:of\: curvature}{2}}}}}$

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Pᴜᴛᴛɪɴɢ ᴛʜᴇ ᴠᴀʟᴜᴇs:

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➦ Focal Length = 20/2

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➦ Focal Length = 10 Cm

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Tʜᴇʀᴇғᴏʀᴇ

• The focal length of concave mirror is 10 Cm

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