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1. Rearrange the boxes given below to make, a sentence that helps us understand opaque, objects., , I OW S I !AKE I !0 PA QI I U E O I IBJ E Cl .I TS MI, !SHA DI, Ans:, !OPAQIUEOIBJECITSM I AKE ISHADIOWS!

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2. Classify the objects or materials given, below as opaque, transparent or translucent, and luminous or non-luminous:, Air, water, a piece of rock, a sheet of, aluminium, a mirror, a wooden board, a sheet, of polythene, a CD, smoke, a sheet of plane, glass, fog, a piece of red hot Iron, an, umbrella, a lighted fluorescent tube, a wall, a, sheet of carbon paper, the fame of a gas, burner, a sheet of cardboard, a lighted torch, a, sheet of cellophane, a wire mesh, kerosene, stove, sun, firefly, moon., Ans:, OBJ!CT, Alt, Wat.er, A pioce of rode, A _ , ol alumlalum, Amlnw, , ,._,,_, , -.., _,, -, , Albtt(ofpolphcM, ACO, A _,, , ,, , or plane .,..., , A pioce or ffll hoe Iron, An umbnlla, A Upt~ n u - ,, , OPAQUE, , llWISPARENT, , -, , ,I, , -, , ,I, , ✓, ✓, ✓, , -,I, , ,I, , ,I, , tubo, , ,I, , A wall, , ✓, , ,.-.orcart>on, ✓, , YM !lame of a, , ...., , Albtt(olcud-.d, A Ual>ted tarcb, A _ , ol ~, A wlr.awoh, , -·-, , ✓, , ,I, ,I, , -, , ✓, , Sw,, , ✓, , flrelly, , ,I, , Moon, , ✓, , ,I, , ---, , ,I, , ---, , ,I, , ---, , -, , nMCSWCl!:111', , WIIINOUS, , --, , --, , ✓, , ,I, , ,I, , -, , -, , --, , --, , ✓, , ✓, , -, , ,I, ,I, ,I, ✓, ✓, , ,I, ,I, , -, , ,I, ,I, ,I, ✓, , ,I, , ✓, , ,I, , ,I, , -, , ,I, , -, , -, , ,I, , -, , ,I, , -, , -, , -, , NON-LUMINOUS, , ,I, , ,I, , ,I, ,I, , -, , ,I

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3. Can you think of creating a shape that, would give a circular shadow If held In one, way and a rectangular shadow If held In, another way?, Ans: Yes, there are many things which give a, circular shadow if held in one way and a, rectangular shadow if held in another way. For, example: a cylinder, a circular disc etc., , Saeen, Cylinder, , J'IC. 11.9, , (a) Getting circular abadow with a cylinder, , Cylndef, , J'IC. 11.9 (bt Getting•, , rectangular ahadow with a cylinder.

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4. In a completely dark room, If you hold up a, mirror In front of you, will you see a reflection, of yourself In the mirror?, Ans: No, in a completely dark room no image, will be formed because there is no light in the, room so no reflection of light takes place and, no image will be formed.