railway RRB Technician Grade 3 Mock Test 2024 General Science Physics

इनमें से कौन सा एक ऑप्टिकल लेंस नहीं है?

1
सूक्ष्मदर्शी
2
परिदर्शी
3
दूरदर्शी
4
स्टेथेस्कोप
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