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Universitas Jenderal Soedirman Purwokerto FISIKA DASAR II GEOMETRIC OPTICS Universitas Jenderal Soedirman Purwokerto Geometric Optics The field of geometric optics involves the study of the propagation of light, with the assumption that light travels in a fixed direction in a straight line as it passes through a uniform medium and changes its direction when it meets the surface of a different medium or if the optical properties of the medium are nonuniform in either space or time. Mukhtar Effendi Ilmu Fisika 2 Universitas Jenderal Soedirman Purwokerto Reflection Mukhtar Effendi Ilmu Fisika 3 Universitas Jenderal Soedirman Purwokerto Two mirrors make an angle of 120° with each other. A ray is incident on mirror M1 at an angle of 65° to the normal. Find the direction of the ray after it is reflected from mirror M2. Mukhtar Effendi Ilmu Fisika 4 Universitas Jenderal Soedirman Purwokerto Refraction Mukhtar Effendi Ilmu Fisika 5 Universitas Jenderal Soedirman Purwokerto Mukhtar Effendi Ilmu Fisika 6 Universitas Jenderal Soedirman Purwokerto Sin1 n2 v1 1 Sin 2 n1 v2 2 Mukhtar Effendi Ilmu Fisika 7 Universitas Jenderal Soedirman Purwokerto Sebuah cahaya yang 550 memiliki panjangingelombang 550 A beam berkas of light of wavelength nm traveling air is incident nm berjalan di udara datang pada sebuah bidang yang on a slab of transparent material. The incident beam makes an transparan. Berkas cahaya datang membentuk sudut 40 angle of 40.0° with thedan normal, andbias the yang refracted beam makes an terhadap garis normal sudut terbentuk adalah angle of 26.0° withnormal. the normal. Findindeks the index of bahan refraction of the 26 terhadap garis Carilah bias tersebut. material. Mukhtar Effendi Ilmu Fisika 8 Universitas Jenderal Soedirman Purwokerto Sebuah laser di dalam CD player membangkitkan cahaya A laser in a compact disc player generates light that has a yang memiliki panjang gelombang 780 nm di udara. wavelength of 780 nm in air. a. berkas ini pada (A)Carilah Find thekecepatan speed of this light cahaya once it enters the saat plastic of memasuki plastik CD (n=1,55) a compact disc (n =1.55). b. gelombang berkas (B)Berapakah What is thepanjang wavelength of this light in the cahaya plastic? ini di dalam plastik CD? Mukhtar Effendi Ilmu Fisika 9 Universitas Jenderal Soedirman Purwokerto Rainbow Mukhtar Effendi Ilmu Fisika 10 Universitas Jenderal Soedirman Purwokerto Total Internal Reflection Mukhtar Effendi Ilmu Fisika 11 Universitas Jenderal Soedirman Purwokerto Spherical Mirrors Mukhtar Effendi Ilmu Fisika 12 Universitas Jenderal Soedirman Purwokerto Mukhtar Effendi Ilmu Fisika 13 Universitas Jenderal Soedirman Purwokerto Images Formed by Refraction Mukhtar Effendi Ilmu Fisika 14 Universitas Jenderal Soedirman Purwokerto Seekor A smallikan fish is berenang swimming pada at a depth kedalaman d below thedsurface di bawah of apermukaan pond. What air. is the Berapakah apparent kedalaman depth of theikan fish, as yang nampak jika dilihat langsung viewed from directly overhead? (tegak lurus) dari atas? Mukhtar Effendi Ilmu Fisika 15 Universitas Jenderal Soedirman Purwokerto Thin Lenses Mukhtar Effendi Ilmu Fisika 16 Universitas Jenderal Soedirman Purwokerto Sebuah lensa konvergen (n=1,52) A converging glass lensdi(nudara. = 1.52) memiliki fokus 40 cm has a focal length of tersebut 40.0 cm inpada air. Carilah fokus lensa Find dimasukkan its focal length it isair yang saat kewhen dalam immersedindeks in water, which memiliki bias 1,33has an index of refraction of 1.33. Mukhtar Effendi Ilmu Fisika 17