Question

14. What is meant by power of lens?​

Answer 1

$\huge\pink{ᴀɴsᴡᴇʀ }$

ᴘᴏᴡᴇʀ ᴏғ ʟᴇɴs ɪs ᴅᴇғɪɴᴇᴅ ᴀs ᴛʜᴇ ʀᴇᴄɪᴘʀᴏᴄᴀʟ ᴏғ ᴛʜᴇ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ ᴛʜᴇ ʟᴇɴs ᴇxᴘʀᴇssᴇᴅ ɪɴ ᴍᴇᴛᴇʀ. sɪ ᴜɴɪᴛ ᴏғ ᴘᴏᴡᴇʀ ɪs ᴅɪᴏᴘᴛʀᴇ ᴅᴇɴᴏᴛᴇᴅ ʙʏ ᴅ. ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ ғɪʀsᴛ ʟᴇɴs ғ1=40 ᴄᴍ=0.

Answer 2

Answer:

Power of lens is defined as the reciprocal of the focal length of the lens expressed in meter. SI unit of power is Dioptre denoted by D. Focal length of first lens f1=40 cm=0.

Explanation:

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