1) The focus of the convex mirror is a. negative b. virtual c. real d. zero
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2) In a compound microscope, the focal length of the objective lens is a. short b. large c. zero d. none of above
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3) Concave mirrors are also called a. convex mirrors b. converging mirrors c. plane mirrors d. focal mirrors
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4) When a ray of light strikes a face of prism perpendicularly, it enters the prism without deviation and strikes the hypotenuse at an angle of a. 30 ° b. 45 ° c. 90 ° d. 60 °
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5) The human eye acts like a a. endoscope b. camera c. telescope d. microscope
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6) The focus is in front of the mirror in a. plane mirror b. convex mirror c. concave mirror d. silver mirror
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7) The speed of light in air is approximately a. 3.0 × 10⁸ m s-¹ b. 4.0 × 10⁸ m s-¹ c. 3.0 × 10⁵ m s-¹ d. 5.0 × 10⁸ m s-¹
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8) The lens which diverges light from a single point is a. concave lens b. convex lens c. biconvex lens d. all of above
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9) Reflection by smooth surfaces is called a. irregular reflection b. refraction c. regular reflection d. reflection
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10) The line passing through the two centers of curvatures of the lens is called a. principal axis b. optical center c. principal focus d. focal length
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11) The lens which causes incident parallel rays of light to diverge at a point is called a. convex lens b. concave lens c. counter lens d. fiber lens
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12) A magnifying glass forms a. real image b. inverted image c. virtual image d. fake image
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13) The endoscope used to examine the throat is called a. cystoscope b. gastroscope c. microscope d. bronchoscope
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14) A spherical mirror whose inner curved surface is reflecting is called a. plane mirror b. convex mirror c. concave mirror d. silver mirror
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15) A compound microscope uses a. 2 lenses b. 1 lens c. 4 lenses d. 5 lenses
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16) The speed of light in glass is approximately a. 3.0 × 10⁸ m s-¹ b. 2.3 × 10⁸ m s-¹ c. 2.0 × 10⁸ m s-¹ d. 2.6 × 10⁵ m s-¹
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17) The angle of reflection and the angle of reflection are a. both negative b. not equal c. equal d. opposite
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18) The speed of light in water is approximately a. 2.3 × 10⁸ m s-¹ b. 3.3 × 10⁸ m s-¹ c. 2.3 × 10⁵ m s-¹ d. 4.3 × 10⁸ m s-¹
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19) The inner part of the fiber optics which carries light is called a. prism b. cladding c. core d. diopters
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20) An object 12 cm in front of a convex mirror forms an image 6 cm behind the mirror. The focal length of the mirror is a. −10 cm b. −14 cm c. −12 cm d. −15 cm
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