A concave mirror has focal length of 20cm.At what distance from the mirror 5cmtall object be placed so that it forms the mirror. Also calculate the size of the object.
Answers
Answered by
0
ᴛʜᴇ ᴅɪꜱᴛᴀɴᴄᴇ ꜱʜᴏᴜʟᴅ ʙᴇ 40 ᴄᴍ ꜰʀᴏᴍ ᴛʜᴇ ᴍɪʀʀᴏʀ ᴛᴏ ꜰᴏʀᴍ ᴀɴ ɪᴍᴀɢᴇ ᴀᴛ 40 ᴄᴍ ᴀɴᴅ ɪɴ ᴛʜɪꜱ ᴄᴀꜱᴇ ᴛʜᴇ ꜱɪᴢᴇ ᴏꜰ ᴛʜᴇ ɪᴍᴀɢᴇ ᴡɪʟʟ ᴀʟꜱᴏ ʙᴇ.
ᴇQᴜᴀʟ ᴛᴏ ᴛʜᴇ ᴏʀɪɢɪɴᴀʟ ᴏʙᴊᴇᴄᴛ , ᴍᴇᴀɴꜱ 5 ᴄᴍ .
ᴛʜᴇ ᴀʙᴏᴠᴇ ᴘʜᴇɴᴏᴍᴇɴᴏɴ ɪꜱ ᴛʜᴇʀᴇ ʙᴇᴄᴀᴜꜱᴇ ᴡʜᴇɴᴇᴠᴇʀ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ɪꜱ ᴋᴇᴘᴛ ᴏɴ ᴛʜᴇ ᴄᴇɴᴛʀᴇ ᴏꜰ ᴄᴜʀᴠᴀᴛᴜʀᴇ ᴏꜰ ᴀ ᴄᴏɴᴄᴀᴠᴇ ᴍɪʀʀᴏʀ , ᴛʜᴇ ᴅɪꜱᴛᴀɴᴄᴇ ᴏꜰ ᴛʜᴇ ɪᴍᴀɢᴇ ᴡɪʟʟ ʙᴇ ᴛʜᴇ ꜱᴀᴍᴇ ᴀꜱ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ᴀɴᴅ ᴛʜᴇ ꜱɪᴢᴇ ᴏꜰ ᴛʜᴇ ɪᴍᴀɢᴇ ᴡɪʟʟ ᴀʟꜱᴏ ʙᴇ ᴛʜᴇ ꜱᴀᴍᴇ.
ɪ ꜰᴏᴜɴᴅ ᴏᴜᴛ ᴛʜᴇ ᴀʙᴏᴠᴇ ɪɴꜰᴏʀᴍᴀᴛɪᴏɴ ᴀꜱ-
ᴡᴇ ᴋɴᴏᴡ-
ꜰᴏᴄᴀʟ ʟᴇɴɢᴛʜ = ᴄᴇɴᴛʀᴇ ᴏꜰ ᴄᴜʀᴠᴀᴛᴜʀᴇ / 2
ꜱᴏ ᴛᴏ ꜰɪɴᴅ ᴛʜᴇ ᴄᴇɴᴛʀᴇ ᴏꜰ ᴄᴜʀᴠᴀᴛᴜʀᴇ, ɪ ᴀᴘᴘʟɪᴇᴅ ᴛʜᴇ ꜰᴏʀᴍᴜʟᴀ .
20 = ᴄ / 2
ᴄ = 40
Similar questions