1) If the angle of incidence at the far-edge is too large, the light would a. escape b. not escape c. end in the object d. spread into seven colors
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2) We cannot see through a. transparent objects b. opaque objects c. luminous objects d. non luminous objects
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3) The convex lens a. shrinks the image b. magnifies the image c. sharpens the image d. increases the contrast of the image
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4) Non luminous objects are colored by the process of a. color addition b. color subtraction c. color multiplication d. color division
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5) The dispersion can be noticed by passing a white light through a. glass b. mirror c. water d. prism
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6) To enable you to see a rainbow the sun should be positioned a. in front of you b. behind you c. on your left side d. on your right side
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7) Night blindness is caused due to a. lack of rods b. over numbering of cones c. problem in cones d. problem in rods
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8) The angle which is formed between normal ray and the ray entering a medium is known as a. critical angle b. angle of incidence c. angle of reflection d. angle of refraction
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9) Focal point is the point where a. light spread out quickly b. light rays meet c. lens can magnify the most d. dispersion of light occurs
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10) Waves on top of spectrum are a. infrared waves b. gamma rays c. x-rays d. ultraviolet rays
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11) The angle between the normal ray and the ray leaving a medium is known as a. critical angle b. angle of incidence c. angle of reflection d. angle of refraction
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12) Filters do not a. change the light b. change the color c. change the primary colors d. change the secondary colors
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13) Rods are sensitive to a. bright light b. dim light c. colored Vision d. blurriness
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14) If light enters a dense object in angle of zero, it would a. bend b. reflect back c. go straight d. turn towards right
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15) Leaf looks green because it absorbs a. all colors except green b. green color and reflects others c. red and yellow color d. blue and yellow color
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16) If light enters a glass, it slows down more than a. 200,000 km/s b. 150,000 km/s c. 100,000 km/s d. 50,000 km/s
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17) When light enters a dense medium, it leaves the object from a. the same point b. a different point c. the far end d. the close end
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18) Light bends in all materials at a. same angle b. different angles c. nearly same angles d. opposite angles
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19) Refractive index of diamond is a. 2 b. 2.5 c. 2.42 d. 2.65
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20) The color of one part of spectrum is a. brown b. cyan c. indigo d. magenta
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