Is the focal length of a spherical mirror same for different colours?
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It does not depend on the light used. So, it is the same for all lights. Hence, the correct answer is the focal length of a spherical mirror is the same for all lights. Note: The focal length of a mirror or lens is Independent of its wavelength and hence it is also independent of its color.
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Iᴛ ᴅᴏᴇs ɴᴏᴛ ᴅᴇᴘᴇɴᴅ ᴏɴ ᴛʜᴇ ʟɪɢʜᴛ ᴜsᴇᴅ. Sᴏ, ɪᴛ ɪs ᴛʜᴇ sᴀᴍᴇ ғᴏʀ ᴀʟʟ ʟɪɢʜᴛs. Hᴇɴᴄᴇ, ᴛʜᴇ ᴄᴏʀʀᴇᴄᴛ ᴀɴsᴡᴇʀ ɪs ᴛʜᴇ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ ᴀ sᴘʜᴇʀɪᴄᴀʟ ᴍɪʀʀᴏʀ ɪs ᴛʜᴇ sᴀᴍᴇ ғᴏʀ ᴀʟʟ ʟɪɢʜᴛs. Nᴏᴛᴇ: Tʜᴇ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ ᴀ ᴍɪʀʀᴏʀ ᴏʀ ʟᴇɴs ɪs Iɴᴅᴇᴘᴇɴᴅᴇɴᴛ ᴏғ ɪᴛs ᴡᴀᴠᴇʟᴇɴɢᴛʜ ᴀɴᴅ ʜᴇɴᴄᴇ ɪᴛ ɪs ᴀʟsᴏ ɪɴᴅᴇᴘᴇɴᴅᴇɴᴛ ᴏғ ɪᴛs ᴄᴏʟᴏʀ.
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