Question

19)_____is used in reflecting optical telescope.

a)mirror

b) lens​

Answer 1

$\huge\color{violet}{ᎪΝՏᏔᎬᎡ}$

ᴍɪʀʀᴏʀ ɪs ᴜsᴇᴅ ɪɴ ʀᴇғʟᴇᴄᴛɪɴɢ ᴏᴘᴛɪᴄᴀʟ ᴛᴇʟᴇsᴄᴏᴘᴇ.

Answer 2

Explanation:

mirror is used in reflecting optical telescope.

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