The radius of a curvature Of a spherical mirror is 25cm find his focal
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➡️ Rᴀᴅɪᴜs ᴏғ ᴄᴜʀᴠᴀᴛᴜʀᴇ
= 2 x ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ.
Sᴏ, ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ
= ½× ʀᴀᴅɪᴜs ᴏғ ᴄᴜʀᴠᴀᴛᴜʀᴇ
= ½×20 ᴄᴍ
= 10 ᴄᴍ
½(25) = 12. 5ᴄᴍ.
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Answer:
GIVEN:
f = ? R = 25cm
ANS : We know that
R = 2f
25 = 2f
f = 25/2
f = 12.2 cm
hence the focal length of the mirror is 12.2 cm
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