A periscope is mainly used in —

এই অধ্যায়ের আরও প্রশ্ন

• C-09-Q069A periscope made with prisms is more effective than one made with ordinary mirrors because —
• C-09-Q070In binoculars, prisms are used mainly to —
• C-09-Q071A lens is created using —
• C-09-Q072Lenses are NOT used in —
• C-09-Q073A convex lens is —
• C-09-Q074A concave lens is —
• C-09-Q075A convex lens is also called a —
• C-09-Q076A concave lens is also called a —
• C-09-Q077The centres and in a lens are called —
• C-09-Q078A thin lens is one in which —