A ray enters glass from air at 30°. If the refractive index of glass is 1.50, what is the angle of refraction, 19.5°, Light travels from water of refractive index 1.33 into glass of refractive index 1.52 at 40°. Find the angle in glass, 34.0°, A light ray passes from glass of refractive index 1.60 into air. Calculate the critical angle, 38.7°, The critical angle of a transparent block is 42°. Calculate its refractive index in air, 1.49, A ray in glass of refractive index 1.50 strikes a glass-air boundary at 50°. State what happens, Total internal reflection occurs, For a material with refractive index 1.70, determine the minimum angle of incidence in the material for total internal reflection, 36.0°, A prism has refractive index 1.60. What is the greatest angle in air for refraction into the prism to produce 30° inside, 53.1°, An object is 30 cm from a converging lens of focal length 10 cm. Find the image distance, 15 cm, An object is placed 18 cm from a converging lens of focal length 12 cm. Calculate the image distance, 36 cm, A converging lens of focal length 8 cm forms a real image 24 cm from the lens. Find the object distance, 12 cm, An object 4 cm high is placed 30 cm from a converging lens of focal length 20 cm. Determine image height, 8 cm inverted, A converging lens forms an image with magnification 3 when the object is 12 cm away. Find the focal length, 9 cm, An object is placed at twice the focal length of a converging lens. Describe the image formed, Real inverted same size, A virtual image is formed 15 cm from a converging lens when the object is 10 cm away. Find the focal length, 30 cm, A ray enters a semicircular glass block normally through the curved surface and meets the flat face at 41°. If the critical angle is 39°, what happens at the flat face, Total internal reflection occurs

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