practical physics
Sunday, 26 june 2016, experiment 12: refractive index.
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Verification of Snell’s law of refraction (and hence finding the refractive index of glass)
This experiment is on the Verification of Snell’s law of refraction (and hence finding the refractive index of glass).
Experiment: Verification of Snell’s law of refraction
Apparatus : light box, glass block, and protractor
Method: (refer to the diagram above)
- First, we have to place a glass block and mark its outline.
- Then we have to use the lightbox to shine a ray of light from it.
- Then, let’s mark the position of the light ray as it enters and leaves the block.
- Then, we have to remove the block.
- Then, we will draw in the normals and measure i and r, as shown in the diagram.
Now we have to plot a graph of sin i against sin r .
A straight line through the origin verifies Snell’s law of refraction , i.e. sin i is directly proportional to sin r.
The slope of the line is the refractive index.
Note: Larger angles will lead to a smaller percentage error.
This article is for science/physics students of the Leaving Certificate , and other boards like CBSE.
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This experimental data is slightly di erent as instead of Eq. 1 giving us the refractive index, instead we get: Sin i Sin r =nair nperspex 1:00 nperspex (6) Therefore the values we get from our calculations will have to be inverted in order to nd the refractive index. Table 2: Experiment 2: Snell’s Law Results Angle of incidence Sin
Jun 26, 2016 · The refractive index (n) of a transparent material can be determined by measuring the angle of incidence and the angle of refraction as a ray of light enters, or leaves the material. Refractive index is a number that indicates how fast light travels in a transparent medium. The higher the refractive index the slower the speed of light in that ...
a phenomenon known as refraction. In this experiment you measure the change in direction of light beams as they refract or reflect at a boundary to determine the index of refraction of a transparent object. The objectives of this experiment are as follows: 1. To measure the angles of incidence and refraction at a boundary between media 2.
Jul 13, 2022 · Analysis of Results. i and r are always measured from the normal; For light rays entering perspex block, the light ray refracts towards the central line:; i > r. For light rays exiting the perspex block, the light ray refracts away from the central line:
Thus, the mean refractive index of the material = 1.504 7 Discussions •It must be ensured that the light rays coming out of collimator are parallel. Hence, the collimator must be focussed properly before the experiment. •The plane on which the priam rests must be horizontal •The slit must be as thin as possible in order to avoid ...
Therefore total absolute uncertainty for the refractive index: 1.28 4.9 100 0.06 u r Conclusion: As the given value for the refractive index of water is 1.33, the most accurate mirrors also had the longest focal length. The mirror with the longest focal length, 30 cm, gave the refractive index to be 1.34±0.03, extremely close to the given value.
PHY Pack 4 - Refractive Index ’ Law) 6 Produced by Physics group, University of Cape Coast, as part of a DelPHE funded Project 1 1 OA n IA r a real depth apparent depth 1.4 from which we can find the refractive index of the medium in which the ray originates, n1, by rearranging to give: a r apparent depth real depth n1 1.5
EXPERIMENT AIM To determine refractive index of a glass slab using a travelling microscope. APPARATUS AND MATERIAL REQUIRED A travelling microscope, a glass slab, lycopodium powder/chalk dust and a paper. 141414 Fig. E 14.1 Formation of image I of a point 0 in a glass slab PRINCIPLE If a glass slab is placed in air on a horizontal surface and ...
different media. They are asked specifically to find the refractive index of a fluid. Aim The students are to determine the refractive index of a liquid by the real/apparent method. Practical Skills developed 1. Use the no-parallax technique to locate an apparent image of a real object 2. Determination of the refractive index of a fluid 3.
Jan 15, 2024 · This experiment is on the Verification of Snell’s law of refraction (and hence finding the refractive index of glass). Experiment: Verification of Snell’s law of refraction Apparatus : light box, glass block, and protractor