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For seeing objects at the surface of water from a submarine underwater the instrument used is?

For seeing objects at the surface of water from a submarine underwater the instrument used is? Correct Answer Periscope

সাবমেরিন কর্তৃক পানির উপরিপৃষ্ঠ পর্যবেক্ষণে, ভিড় এড়িয়ে খেলা দেখতে এবং পাকস্থলীর অঙ্গসমূহের অবস্থান জানতে পেরিস্কোপ যন্ত্র ব্যবহার করা হয়। দূরের যন্ত্র পর্যবেক্ষণে ব্যবহৃত হয় টেলিস্কোপ । ক্যালিডোস্কোপ । ক্যালিডোস্কোপ একটি আলোকীয় যন্ত্র, যা খেলনা হিসেবে ব্যবহৃত হয়। বৈজ্ঞানকি কাজে ও আলোর বর্ণালীর বিশ্লেষণে ব্যবহৃত হয় স্পেকট্রোস্কোপ।

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For seeing objects at the surface of water from a submarine under water , the instrument used is -
For seeing objects at the surface of water from a submarine under water, the instrument used is
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