1) What is the characteristics of an image if an object is placed in front of a convex mirror? a) real, inverted, diminished b) virtual, upright, magnified c) virtual, upright, diminished d) virtual, inverted, magnified 2) A small bulb is at distance of 1.6m from the screen and a thin convex lens with a focal length of 30cm is placed between the bulb and the screen. Determine two positions of the convex lens that can produce a sharp image on the screen. a) 120cm & 35 cm b) 115cm & 40cm c) 160cm & 55cm d) 120cm & 40cm 3) What is normal adjustment of telescope? a) D = 0 b) D = fo+fe c) D > fo+fe d) D < fo+fe 4) The pencil appears bent in the water. Name the phenomenan occur. a) Total Internal Reflection b) Dispersion of Light  c) Reflection of Light d) Refraction of Light 5) Refraction of light occurs when a) light ray hits a surface and bounces back b) light ray changes its direction when it travels from a medium into another medium of different densities c) light ray passes through a very small gap 6) Absolute refractive index of any medium is always ________ or ________ a) 0 b) equal to 1 c) less than 1 d) more than 1 7) Critical angle, c is the angle of ________ in the medium of high optical density when the angle of ________ in the medium of lower optical density is equal to _______ . a) refractive index, critical, 90° b) incidence, refraction, 90° c) refraction, incidence, 90° d) incidence, refraction, 180° 8) Which of the following is the distance of the object, u? a) u = 2F b) 2F > u > F c) 2F < u< F d) u = F 9) The refractive index of water is 1.45. What is the critical angle of water? a) 44.2 b) 45.3 c) 43.6 10) Which equipment uses prisms and lenses? a) telescope b) microscope c) binocular d) slide projector 11) What is the characteristics of an image if an object is placed infront of a concave lens? a) real, upright, diminished b) virtual, inverted, magnified c) virtual, inverted, diminished d) virtual, upright, diminished 12) What is the distance between the boy and his image when the mirror is moved 0.75m away from the boy? a) 8m b) 8.75m c) 9.5m d) 11m 13) Calculate the focal length of the convex lens. a) 4.8cm b) 15.7cm c) 12.0cm d) 13.3cm 14) If the rays DE and PQ are parallel with the sides BC and LM respectively, calculate the value of θ a) 24.2° b) 28.6° c) 35.8° d) 37.9° 15) The refractive index of water can be calculated using the formula a) b) c) d) 16) Diagram shows a beam of light travelling from air to medium Y. What is the refractive index of medium Y? a) 1.23 b) 1.42 c) 1.52 d) 2.22 17) What cause light to appear refracted? a) temperature of the surrounding b) velocity of light c) distance of object 18) Determine the angle of refraction of light ray in the prism if the refractive index of the prism is given as 1.50. a) 22.5 b) 28.1 c) 27.3

Light and Optics

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