which lens is used if it's 'D'value is negative
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Answer:
Concave lens is used if it's 'D'value is negative.
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ᴛʜᴇ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ ᴀ ᴄᴏɴᴠᴇx ʟᴇɴs ɪs ᴘᴏsɪᴛɪᴠᴇ ᴀɴᴅ ᴛʜᴀᴛ ᴏғ ᴀ ᴄᴏɴᴄᴀᴠᴇ ʟᴇɴs ɪs ɴᴇɢᴀᴛɪᴠᴇ. ᴡᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ ᴘᴏᴡᴇʀ ᴏғ ᴀ ʟᴇɴs ɪs ɢɪᴠᴇɴ ᴀs (1 / ғ). ᴛʜᴜs, ғᴏʀ ᴛʜᴇ ᴄᴏɴᴠᴇx ʟᴇɴs, ɪғ ᴛʜᴇ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ɪs ᴘᴏsɪᴛɪᴠᴇ ᴛʜᴀɴ ᴛʜᴇ ᴘᴏᴡᴇʀ ɪs ᴀʟsᴏ ᴘᴏsɪᴛɪᴠᴇ. sɪᴍɪʟᴀʀʟʏ, ғᴏʀ ᴛʜᴇ ᴄᴏɴᴄᴀᴠᴇ ʟᴇɴs, ᴛʜᴇ ᴘᴏᴡᴇʀ ɪs ɴᴇɢᴀᴛɪᴠᴇ.
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