alam satu bongkan kaca. Sudut genting kaca itu ialah 42°. Diagram 9 shows a light ray, P directed into a glass block. The critical angle of the glass is 42°. Diagram 7 shows a light ray is directed into a glass block. Garis normal Normal line D Bongkah kaca Glass Nock Bongkah kaca Glass block Sinar cahaya Light ray A Rajah 9 Diagram 9 Rajah 7 Diagram 7 Antara arah A, B, C dan D, arah manakah sinar cahaya itu bergerak dari titik Q? At which direction A, B, C or D does the light ray moves from point Q? Antara sudut A, B, C dan D, yang manakah adalah sudut biasan? At which angle A, B, C or D is the angle of refraction? 16 Rajah 8 menunjukkan satu objek diletakkan di hadapan satu cermin cekung. Jarak objek itu adalah kurang daripada panjang fokus, f cermin itu. Diagram 8 shows an object placed in front of a concave mirror. The object distance is less than the focal length, f of the mirror. 18 Scorang murid melukis sinar cahaya yang melalui kanta P, Q, R dan S seperti ditunjukkan dalam gambar rajah sinar berikut. F ialah titik fokus kanta P, Q, R dan S. A student draws light rays passing through lenses P, Q. R and S as shown in the following ray diagrams. F is the focal point of lenses P, Q, R and S. I III R Objek Object Cermin cekung Concave mirror II IV Rajah 8 Diagram 8 Antara yang berikut, yang manakah ciri-ciri bagi imej terbentuk? Which of the following are the characteristics of the image formed? A Nyata, tegak, diperbesar Real, upright, magnified B Nyata, songsang, diperkecil Real, inverted, diminished C Maya, tegak, diperbesar Virtual, upright, magnified D Maya, songsang, diperkecil Virtual, inverted, diminished Gambar rajah sinar yang manakah menunjukkan lintasan sinar cahaya yang betul? Which ray diagram shows the correct path of the light rays? A I I sahaja Il only B I, II dan IV sahaja I, Il and IV only CI dan III sahaja I and III only D I, II, III dan IV I, II, III and IV [Lihat halaman sebelah)

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