Question

At what distance an object from a concave mirror having focal length of 20 cm should be placed so that the mirror forms a virtual image at 10 cm from the mirror?
A) −12 cm
B) −30 cm
C) −6.6 cm
D) −25 cm​

Answer 1

Now, to get a virtual image by the concave mirror, the object distance must be less than focal length. Hence, the required maximum object distance is 10 cm. Option B is the correct answer.

Answer 2

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ᴀᴛ ᴡʜᴀᴛ ᴅɪsᴛᴀɴᴄᴇ ᴀɴ ᴏʙᴊᴇᴄᴛ ғʀᴏᴍ ᴀ ᴄᴏɴᴄᴀᴠᴇ ᴍɪʀʀᴏʀ ʜᴀᴠɪɴɢ ғᴏᴄᴀʟ ʟᴇɴɢᴛʜ ᴏғ 20 ᴄᴍ sʜᴏᴜʟᴅ ʙᴇ ᴘʟᴀᴄᴇᴅ sᴏ ᴛʜᴀᴛ ᴛʜᴇ ᴍɪʀʀᴏʀ ғᴏʀᴍs ᴀ ᴠɪʀᴛᴜᴀʟ ɪᴍᴀɢᴇ ᴀᴛ 10 ᴄᴍ ғʀᴏᴍ ᴛʜᴇ ᴍɪʀʀᴏʀ?

ᴀ) −12 ᴄᴍ

ʙ) −30 ᴄᴍ

ᴄ) −6.6 ᴄᴍ ✔️

ᴅ) −25 ᴄᴍ

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ᴘʟᴇᴀsᴇ ʀᴇғᴇʀ ᴀᴛᴛᴀᴄʜᴍᴇɴᴛ ♥️!!