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### 29 True/False questions

1. A beam of light in air is incident at an angle of 35° to the surface of a rectangular block of clear plastic (n= 1.49). What is the angle of refraction?23°

2. What type of image does a converging lens produce?always negative.

3. An object that is 18 cm from a converging lens forms a real image 22.5 cm from the lens. What is the magnification of the image?5.71 cm

4. An object is placed 14.0 cm from a diverging lens. If a virtual image appears 10.0 cm from the lens on the same side as the object, what is the focal length of the lens?-34 cm

5. The focal length for a converging lens isreal of virtual

6. Atmospheric refraction of light rays is responsible for which of the following effects?mirages

7. An object is placed 20.0 cm from a thin converging lens along with the axis of the lens. If a real image forms behind the lens at a distance of 8.00 cm from the lens, what is the focal length of the lens?5.71 cm

8. In what direction does a focal ray from an object proceed after passing through a diverging lens?The ray is directed away from the focal point, F.

9. Which is an example of refraction?always negative.

10. Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?total internal reflection

11. A virtual image has a ___ image distance (q) and is located in ___ of the lens.real

12. When a light ray passes from zircon (n= 1.923) into fluorite (n= 1.434) at an angle of 60°, its path isbent away from the normal.

13. A ray of light in air is incident on an air-to-glass boundary at an angle of exactly 30.0° with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal?18.0°

14. All of the following images can be formed by a converging lens except which one?real of virtual

15. The ___ of light can change when light is refracted because the medium changes.wavelength

16. In what direction does a parallel ray from an object proceed after passing through a converging lens?The ray passes through the focal point, F.

17. When a light ray moves from air into glass, which has a higher index of refraction, its path isbent away from the normal.

18. What type of image is formed when rays of light actually intersect?real

19. If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?Sunrise would be later, and sunset would be earlier.

20. In what direction does a focal ray from an object proceed after passing through a converging lens?The ray passes through the focal point, F.

21. Carbon tetrachloride (n= 1.46) is poured into a container made of crown glass (n= 1.52). If a light ray in the glass is incident on the glass-to-liquid boundary and makes an angle of 30.0° with the normal, what is the angle of the corresponding refracted ray with respect to the normal?31.4°

22. How many focal point and focal lengths do converging and diverging lenses have?always negative.

23. When a light ray passes from water (n= 1.333) into diamond (n= 2.419) at an angle of 45°, its path isbent away from the normal.

24. Refraction is the bending of a wave disturbance as it passes at an angle from one ___ into another.medium

25. A film projector produces a 1.51 m image of a horse on a screen. If the projector lens is 4.00 m from the screen and the size of the horse on the film is 1.07 cm, what is the magnitude of the magnification of the image?5.71 cm

26. In what direction does a parallel ray from an object proceed after passing through a diverging lens?The ray is directed away from the focal point, F.

27. When light passes at an angle to the normal from one material into another material in which its speed is lower,it is bent toward the normal to the surface.

28. When light passes at an angle to the normal from one material into another material in which its speed is higher,it is bent away from the normal to the surface.

29. The focal length for a diverging lens isreal of virtual