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1) If lsquo;p’ is object distance,lsquo;q’ is image distance from the mirror and lsquo;f’ is the focal length of the mirror then 1/f is equal to a. 1/p - 1/q b. 1/q - 1/p c. 1/p + 1/q d. 1/p × 1/q
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2) As compared to the single lens, a compound microscope gives a. smaller magnification b. greater magnification c. no magnification d. equal magnification
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3) In 1900, Planck suggested that light consists of small packets of energy that are called a. neutron b. photon c. electron d. radii
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4) The SI unit of power of a lens is a. Pascal b. omega c. Newton d. diopter
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5) An object 4 cm high is placed at a distance of 12 cm from a concave lens, If the focal length is 8 cm then the size of the object is a. 10 cm b. 5 cm c. 4 cm d. 8 cm
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6) In different media, refraction of light is caused by the difference in speed of a. sound b. light c. heat d. waves
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7) When the angle of incidence becomes larger than the critical angle, then a. refraction occurs b. reflection occurs c. defraction occurs d. no refraction occurs
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8) The angle of incidence and angle of reflection is a. equal b. un equal c. coherent d. opposite
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9) The incident ray, the normal and the reflected ray at the point of incidence all lie in the same plane. This is the law of a. reflection b. refraction c. defraction d. acoustics
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10) If the angle of incidence becomes larger than the critical angle then the phenomena of a. reflection occurs b. refraction occurs c. total internal reflection occurs d. none of above
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11) An image of a statue appears to be 12.6 cm behind a concave mirror with a focal length of 14.5 cm. The distance between the mirror and the statue is a. 6.74 cm b. 9.82 cm c. 4.56 cm d. 11.6 cm
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12) When light passes through a prism it deviates from its original path because of a. reflection b. refraction c. defraction d. acoustics
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13) The midpoint of the curved surface of a spherical mirror is called a. radius of curvature b. pole c. center of curvature d. focal length
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14) If the angle of incidence lsquo;i&rsquo increases, the angle of refraction lsquo;r&rsquo a. also increases b. remains constant c. becomes zero d. decreases
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15) The thin lens formula assumes that lenses have a. no thickness b. thickness c. no diopters d. none of above
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16) A bundle of thousands of optical fibers bonded together is called a. diopters b. heat pipe c. light pipe d. microscope
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17) The outer concentric shell of the fiber optics is called a. diopters b. core c. prism d. cladding
|
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18) The phenomenon in which light traveling in one medium falls on the surface of another medium and turns back in the same medium is called a. Refraction of light b. Reflection of light c. Bending of light d. Diffraction of light
|
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19) In mirrors, images are formed through a. reflection b. refraction c. defraction d. acoustics
|
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20) Which of the following is used in fiber optics? a. total internal reflection of light b. total external reflection of light c. total internal refraction of light d. total external refraction of light
|
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