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Rectangular Glass Slab Experiment Download And ModifyYou can always download and modify the image size according to your needs. Emergent ray is parallel to the incident ray along with original direction but it will be laterally displaced to the left of the incident ray. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. These refractions at both the surfaces obey the laws of refraction (Refer to basic building concept). Draw its boundary. Remove the glass slab and label the boundary as A 1, B 1, C 1, D 1 as shown below. Fix two sharp pointed pin P 1 and Q 1 vertically erected on the line P 1 O 1 at a distance of 4 to 6 cm apart. Look at the feet of pins (not their heads) P 1 and Q 1 from the other parallel opposite face of the slab, i.e. C 1 D 1 along the plane of paper. Fix other two pins R 1 and S 1 in such a way that R 1, S 1 and the image of P 1 and Q 1 lie on a same straight line. Join the points R 1 and S 1 within the encircle and produce upto the edge C 1 D 1. Join O 1 and O 2. It will represent the path of ray inside the glass slab, i.e. On the face PQ, a ray AB is incident at an angle of incidence i 1. It bends towards the normal, on entering the glass slab, and travels along BC inclined at an angle of refraction r 1. The refracted ray BC is incident on the face SR at an angle of incidence i 2. The emergent ray CD bends away from the normal at an angle of refraction r 2. Now, using Snells law, we have Refraction from air to glass at face PQ. This lateral shift in the path of light on emerging from a medium with parallel faces is called lateral displacement. It is found that the lateral displacement is directly proportional to the thickness of the glass slab. Simply apply as teacher, take eligibility test and start working with us.
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