To determine the Wave-length of sodium light by a plane diffraction grating, using spectrometer.
Apparatus: A spectrometer, spirit level, sodium lamp, diffraction grating with clamping arrangement and eye-piece. Observations and Calculations:Least count of the spectrometer = Value of the smallest scale division No of divisions on the Vernier scaleNo. of lines ruled on the […]
To determine the wave-length of Sodium light by Newton ‘s Rings,
Apparatus: Newton’s ring apparatus, convex lens, Plano-convex lens, screen with hole, a source of sodium light, traveling microscope, spherometer. bservations and Calculations: Pitch of the spherometer screw = Number of divisions on the circular scale = N = Least count of the spherometer = pitch / N Distance between the two legs (i) (ii) (iii) […]
Determine the refractive index of a liquid using a concave mirror.
Apparatus: Concave mirror of long focal length vertical stand with clamp, a plumb line/parallax needle. Meter rod, index needle, liquid (water) and wooden stand) Observations: Approximate focal length of a concave mirror = ………………cm No.ofObs. Distance between the pole of mirror and the tip of the needle in no parallax position Refractive index Without liquid […]
To find refractive index of the material of prism by critical angle method Apparatus:
Glass prism, drawing board, sheet of white paper, drawing pins, protractor, set squares, pins and a meter rod. Observations and Calculations: No. of Obs. Angle of incidence PNO=angle ‘‘C’ Critical Angle of reflection ‘r’ ZPNF 1234 Mean value of critical angle = C = Refractive Index of glass = = 1 / sinc […]
Find the refractive index of a transparent liquid using a hollow prism.
Hints: The hollow prism of glass is filled with the liquid whose refractive index is to be determined. Find the angle of prism and minimum deviation as explained, and calculate the refractive index from same formula. VIVA VOCE Q.1. What is the function of a collimator in a spectrometer? Ans. The collimator produces parallel rays of light. […]
