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the following colors will have minimum critical angle when light passes from glass to air","choices":[{"text":"Red","value":"A"},{"text":"Blue","value":"B"},{"text":"yellow","value":"C"},{"text":"Orange","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":11960,"question":"Light traveling through vacuum enters water which characteristic of light does not charge","choices":[{"text":"Velocity","value":"A"},{"text":"Frequency","value":"B"},{"text":"Wavelength","value":"C"},{"text":"Amplitude","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":11959,"question":"In compound microscope the focal length of eye piece is","choices":[{"text":"Large","value":"A"},{"text":"Small","value":"B"},{"text":"Same as objective","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":11958,"question":"If focal length of objective is increased","choices":[{"text":"Magnifying power of compound microscope decreased","value":"A"},{"text":"Magnifying power of astronomical 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calls can be carried by single mode step index fibre","choices":[{"text":"25000","value":"A"},{"text":"96000","value":"B"},{"text":"14000","value":"C"},{"text":"21000","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":11947,"question":"Single mode step index fibre has a very thin core of about diameter","choices":[{"text":"5.5&nbsp;μm","value":"A"},{"text":"9.5&nbsp;μm","value":"B"},{"text":"5.0&nbsp;μm","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":11946,"question":"Multimode step index fibre has a core of relatively larger diameter such is","choices":[{"text":"125 μm","value":"A"},{"text":"175 μm","value":"B"},{"text":"50 μm","value":"C"},{"text":"100 μm","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":11945,"question":"There will be no change in _______ of light entering glass","choices":[{"text":"Velocity","value":"A"},{"text":"Frequency","value":"B"},{"text":"Direction","value":"C"},{"text":"Wavelength","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":11944,"question":"We can use Fibre optics system for","choices":[{"text":"Image transmitting","value":"A"},{"text":"Word processing","value":"B"},{"text":"Image processing and recelving","value":"C"},{"text":"All","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":11943,"question":"Who gave the corpuscular nature of light","choices":[{"text":"Einstein","value":"A"},{"text":"Newton","value":"B"},{"text":"Maxwell","value":"C"},{"text":"Thomas young","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":11942,"question":"According to Young s experiment the distance between two adjacent bright fringes of blue light is _____ than for oranges light","choices":[{"text":"Less","value":"A"},{"text":"Maximum","value":"B"},{"text":"Equal","value":"C"},{"text":"May be less may be greater depending upon slit 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