Which of the following distances is usually adjustable in the camera? The distance between the
A. lens and the film B. diaphragm and the shutter C. shutter and the film D. diaphragm and the film Correct Answer: Option B B. diaphragm and the shutterA ray from a fixed object is incident on a plane mirror at an angle of 20°. If the mirror is rotated through 30° by how many degree would the reflected ray rotate?
A. 60° B. 50° C. 40° D. 30° Correct Answer: Option A A. 60°The distance between the successive crests of a wave travelling at 20ms-1 is 25cm. Calculate the frequency of the wave.
A. 0.8Hz B. 5.0Hz C. 50.0Hz D. 80.0Hz Correct Answer: Option D D. 80.0Hz Explanation f = v/π = 20/0.25 = 80HzWhich of the following observations cannot be explained using the rectilinear propagation of light?
A. production of images by a pinhole camera B. production of real images of objects by lenses C. formation of an annular eclipse D. diffraction patterns of light Correct Answer: Option D D. diffraction patterns of lightProducts
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