Rio Grande Valley Physics 1402 4) Using the average indices of refraction calcul

Question

Rio Grande Valley Physics 1402 4) Using the average indices of refraction calculated from the 3-ray experiments calculate the velocity of light as it passes through the acrylic rectangle and the acrylic triangle Describe the changes in the direction of the light rays as they move though the convex and concave shapes. Do the refracted rays move away or towards the normal line as they enter the plastic/glass shape? As they leave the shape? 5) onver fy conwer lens.ue l'‘ktr*) c oss each out/ in an "K ".. Describe the direction of the light rays when the convex and concave shapes werc combined. Explain this result.. when 6) oinr asen in ron the eRect, ofcon4104areaoru.ro.la so uohre th, e eh Would there be any difference in the behavior of the rays in the previous question if there is space between the combined convex and concave shapes? 7) Developed By Sjon Clintorn

Explanation / Answer

4. as the given data in the second page is reflection data, it cannot be used to determine refractive index of acralyic, which is needed to calculate the the speed of light inside acrylic. now, the refractive index can be known from the refraction data and not the reflection data

snells law can be further imployed

n = sin(i)/sin(r)

i = angle of incidence

r = angle of refraction

n = refractive index of medium wrt air ( when light is entering the medium from the air)

and speed of ligth inthe medius is then v = c/n

5. for any glass surface, when the light ray enters the glass, it is deflected towards the normal, and when it moves out, it is refraceted away from the normal

hence the change in direction for individual surface wrt to the normal is the same for the convex or concave lens, but the net effect of the light ray encountering different curvatures in both the cases in opposite sequence gives us focussed light in case of convex lens and diffused incase of concave lens

6. when convex and concave shapes are combined, the net effect is a glass slab, and light impinging perpendicularly on a glass slab undergoes no deviation

7. if there is space betweent he convex and concave shapes, then this does not become an effective glass slab and hence the final rays are deflected from their initial direciton of motion

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