Physics-
General
Easy

Question

A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s open square brackets mu subscript text water  end text end subscript equals fraction numerator 4 over denominator 3 end fraction close square brackets blankSpeed of the image of fish as seen by the bird directly in cm/s is

  1. 8    
  2. 6    
  3. 3    
  4. 4    

The correct answer is: 6

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Spherical aberration in spherical mirrors is a defect which is due to dependence of focal length ‘f’ on angle of incidence ‘ q ’ as shown in figure is given by f equals R minus fraction numerator K over denominator 2 end fraction s e c invisible function application theta where R is radius of curvature of mirror and q is the angle of incidence The rays which are closed to principal axis are called paraxial rays and the rays far away from principal axis are called marginal rays As a result of above dependence different rays are brought to focus at different points and the image of a point object is on a point For paraxial rays, focal length approximately is

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