Question

2. Define one
dioptse. Name the instrument used for measuring power of a lens​

Answer 1

Answer:

ᴀ ᴅɪᴏᴘᴛʀᴇ (ʙʀɪᴛɪsʜ sᴘᴇʟʟɪɴɢ) ᴏʀ ᴅɪᴏᴘᴛᴇʀ (ᴀᴍᴇʀɪᴄᴀɴ sᴘᴇʟʟɪɴɢ) ɪs ᴀ ᴜɴɪᴛ ᴏғ ᴍᴇᴀsᴜʀᴇᴍᴇɴᴛ ᴏғ ᴛʜᴇ ᴏᴘᴛɪᴄᴀʟ ᴘᴏᴡᴇʀ ᴏғ ᴀ ʟᴇɴs ᴏʀ ᴄᴜʀᴠᴇᴅ ᴍɪʀʀᴏʀ, ᴡʜɪᴄʜ ɪs ᴇǫᴜᴀʟ ᴛᴏ ᴛʜᴇ ʀᴇᴄɪᴘʀᴏᴄᴀʟ ᴏғ ᴛʜᴇ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴍᴇᴀsᴜʀᴇᴅ ɪɴ ᴍᴇᴛʀᴇs. (1 ᴅɪᴏᴘᴛʀᴇ = 1 ᴍ−1.) ɪᴛ ɪs ᴛʜᴜs ᴀ ᴜɴɪᴛ ᴏғ ʀᴇᴄɪᴘʀᴏᴄᴀʟ ʟᴇɴɢᴛʜ

Explanation:

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ʏᴏᴜ ❣️ ғᴏʟʟᴏᴡ ᴍᴇ

Answer 2

Answer:Answer :- focimeter

Explanation : focimeter is used to determine power of lens . it is known as lensometer and vertometer . It can determine axis , position of the optical centre of a given lens , power of cylindrical lens , also it can determine spherical power . Eyes specialist use it for finding defect in eye vision of patients .