Alat optik yang digunakan untuk melihat benda jauh sehingga tampak lebih dekat dan jelas disebut teropong. Teropong dibedakan menjadi beberapa jenis sebagai berikut.
Teropong Bintang/Teropong Astronomi/Teleskop.
Teropong Bumi/Teropong Medan/Yojana
Teropong Panggung/Teropong Galilei
Teropong Pantul
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