ObservationsFor Water :

Sl.No. ANGLE OF INCIDENCE

ANGLE OF DEVIATION

1. 35o 25o

2. 40o 24o

3. 45o 23o

4. 50o 25o

5. 55o 26o

For Glycerin:

For Benzene:

Sl.No. ANGLE OF INCIDENCE

ANGLE OF DEVIATION

1. 35o 40o

2. 40o 39o

3. 45o 41o

4. 50o 42 o

5. 55o 45o

Calculation

Sl.No. ANGLE OF INCIDENCE

ANGLE OF DEVIATION

1. 35o 39o

2. 40o 38o

3. 45o 35o

4. 50o 40 o

5. 55o 41o

1.                  Water:      µ =  (Sin (60+23 ))/2 = Sin 41.5 Sin(60/2)             Sin 30

                                   =     0.6626      = 1.3252                                        0.5

2.                  Glycerin:   µ =    (Sin(60+35))/2 = Sin(47.5)  Sin(60/2)             Sin 30

=    0.73725        =    1.4745                          0.5

3.                  Benzene : µ = (Sin(60+39))/2 =   Sin(49.5)                                     Sin(60/2)                   Sin 30

= 0.76035 =    1.5207

ConclusionRefractive indices at room temperature:

Watero Actual: 1.33o Experimental: 1.3252

Glycerino Actual: 1.47o Experimental: 1.4745

Benzeneo Actual: 1.50o Experimental: 1.5207

Precautions

1. Angle of incidence should lie b/w 35-60 degree.

2. Pins should be vertically fixed and should lie in same line. 

3. Distance b/w two points should not be less than 10mm. 

4. Same angle of prism should be used for all observation. 

5. Arrow head should be marked to represent emergent and incident ray

Bibliography

physics.about.com

physicsclassroom.com

Laboratory Manual Physics Class XII

New Simplified Physics: A Reference Book - Class 12