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সিনেমা হলে প্রােজেক্টর (Projector) রূপে কোন লেন্স ব্যবহৃত হয় ?
[A] জুম লেন্স (Zoom lens)
[B] মেনিসকাস লেন্স (Meniscus lens)
[C] উত্তল লেন্স (Convex lens)
[D] অবতল লেন্স (Concave lens)
[C] উত্তল লেন্স (Convex lens)
convex lens