Computer · Input and Output Devices
निम्नलिखित में से किस प्रकाश-संवेदनशील इनपुट डिवाइस में एक छोटी ट्यूब में रखी गई एक फोटोसेल और एक ऑप्टिकल सिस्टम होता है, जिसका उपयोग स्क्रीन पर आइटम चुनने के लिए किया जाता है?
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