A class consists of a number of boys whose ages are in A.P., the common difference being 4 months. If the youngest boy is just eight yrs. old and if sum of the ages is 168 yrs, find the number of boys in the class.

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Two parallel beams of light P and Q are incident normally on a prism and the transmitted rays are brought to focus with the help of a convergent lens as shown. If the intensities of the upper and lower beams immediately after transmission from face AC are 4I abd I, respectively, find the resultant intensity at the focus.

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The system of connected flexible cables shown in the figure is supporting 2 loads of 550N and 600N at points B and D. Determine the tensions in various segments of the cable