red orange lines of neon are identified with the wavelength interface 6217a and 6266 a if a grating with 10,000 lines per inch is allowed to received the light. what will be separation of these lines in the third order of spectrum at the focal plane of a convex lens of the focal length 25 cm.

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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