Jawapan Buku Teks Fizik Tingkatan 4 Kssm Aktiviti 13 Top Full May 2026

Why does a diamond sparkle more than a glass piece?

The average refractive index of glass, n = (1.52 + 1.53 + 1.52 + 1.49) / 4 = 1.515 Thus, the refractive index of the glass block is 1.52 . Section B: Calculation Problems (Aktiviti 13.2) Question 1: The speed of light in a medium is 2.0 × 10⁸ m/s. Calculate the refractive index of the medium. (Speed of light in vacuum = 3.0 × 10⁸ m/s) Why does a diamond sparkle more than a glass piece

Diamond has a high refractive index (2.42) and a low critical angle (24.4°). Light entering diamond undergoes multiple total internal reflections before exiting, creating a sparkling effect. Glass has a lower refractive index (~1.5) and higher critical angle, so less total internal reflection occurs. Section D: Lenses (Aktiviti 13.4) Question: A convex lens has a focal length of 10 cm. An object of height 2 cm is placed 15 cm from the lens. Find: a) Image distance b) Magnification c) Image height Calculate the refractive index of the medium

1/10 = 1/15 + 1/v 1/v = 1/10 – 1/15 = (3 – 2)/30 = 1/30 v = 30 cm (Image distance) Glass has a lower refractive index (~1

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