CBSE Class 10 Answered

Practical 12: Tracing the path of the rays of light through a glass prism. 1. After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values of the angle of refraction r and the angle of emergence e and recorded them in the table shown below: [2] Sr. No. i r e I. 30 20 31 II 50 31 49 III 40 25 40 The correct observations are A. I and III B. III and II C. I and II D. I, II and III

Asked by varakalasuchi3 | 28 Feb, 2018, 09:24: PM

Expert Answer

begin mathsize 12px style S r. space N o. space space space angle space i space space space space space space space angle r space space space space space space space angle e space space space space space space space space space fraction numerator sin space i over denominator sin space r end fraction space space space space space space space fraction numerator sin space e over denominator sin space r end fraction minus negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative negative space space space space space space I space space space space space space space space space space space space space space 30 space space space space space space space space space space 20 space space space space space space space space space space 31 space space space space space space space space space space space 1.462 space space space space space space space space 1.506 I I space space space space space space space space space space space space space 50 space space space space space space space space space space 31 space space space space space space space space space space 49 space space space space space space space space space space space 1.489 space space space space space space space space 1.465 I I I space space space space space space space space space space space space 40 space space space space space space space space space space 25 space space space space space space space space space space 40 space space space space space space space space space space space 1.521 space space space space space space space space space 1.521 space end style

i, r and e are angle of incidence, angle of refraction and angle of emergence. As per the law of refraction, ( sin i / sin r ) and ( sin e / sin r ) should give refractive index of glass that is equal to 1.52. As we see from the last two columns, maximum error is 4% . if 4% error is allowed for experimental results,

then all observations are correct.

Answered by Thiyagarajan K | 01 Mar, 2018, 06:37: AM

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