2.The turning back of light as it hits a mirror is called_______________________

3. A kind of mirror that will give a virtual, erect and larger image is ________________

4.The kind of mirror that will produce an image of the same size as the object, erect and virtual is __________________

5. The kind of mirror that will always produce a smaller, virtual and erect image is ___________________.

6.The kind of image that is formed by actual ray of light and can be projected on the screen is called ________________

7. A lens is a transmissive optical device which focuses or disperses a light beam by means of _________________.

8. A lens is __________ if both surfaces are convex.

9. A convex mirror is sometimes referred to as a ____________mirror due to the fact that incident light originating from the same point and will reflect off the mirror surface

10. Any incident ray traveling parallel to the principal axis on the way to a concave mirror will pass through the ____________ upon reflection.

11.Any incident ray traveling towards a convex mirror such that its extension passes through the focal point will reflect and travel parallel to the _______________.

12.Concave mirrors can produce _____________ images

13. The image formed in a convex mirror is always __________.

14. When the object is place at the center of the curvature of a concave mirror, the image is _______________

15. When the object is place at the focus of a concave mirror, the image is _______________

16. When the object is place between C and F of a concave mirror, the image is _______________

17. When the object is place at infinity of a concave mirror, the image is _______________

18.When an object is placed at a finite distance from the mirror, a virtual image is formed between the pole and the focus of the convex mirror. The size of the image is ____________ than compared to that of the object.

19.Torch lights, automobile headlights are examples of _____________________ mirror.

20.Magnifying glasses, telescopes are examples of _______________ mirrors.

21. It is an optical device through which the rays of light converge or diverge before transmitting ________________

22.A ______________ lens is thicker at the edges and thinner in the middle.

23.A ______________lens is thicker in the middle and thinner at the edges.

24. When the object is placed at infinity in front of a concave lens, the nature of the image is _________________

25. When an object location is at 2F in front of a convex lens, the nature of the image is _________________

26. When an object location is at 2F in front of a convex lens, the size of the image is _________________

27. When an object location is beyond 2F in front of a convex lens, the size of the image is _________________

28. Lenses are used in designing some optical devices such as _______________ which are used for formation enlarged images for the heavenly bodies.

29. Lenses are used in ________________ which are used for formation magnified images of the tiny bodies that can not be seen with the naked eye.

30.The _____________ of the lens is a point inside the lens lies on the principal axis in the mid-distance between its faces.

31.The _______________ of the face of the lens is half the diameter of the sphere, where this face is a part of it.

32.The _______________is the straight line that joins between the two centers of curvature of the lens passing by the optical center of the lens.

33.The ______________ of the lens (f) is the distance between the focus and the optical center of the lens

34.The ________________is the point of collection of the refracted light rays (in the convex lens) or their extensions (in the concave lens).

35.Normal” vision corresponds to an acuity of ________

36.A person who cannot see objects smaller than 3 mm at this distance has an acuity of __________________.

37.In this eye defect, the cornea is misshapen and does not properly focus the light entering the eye. Instead of hitting the retina in a focused point, the light is spread over two or more points.

38.It is an age-related condition that occurs as the lens loses its ability to change shape.

39. It is caused by insufficient curvature of the cornea relative to the length of the eyeball. This puts the focal point of the light rays behind the retina instead of on it.

40.It is caused by too much curvature of the cornea relative to the length of the eyeball. This causes the light rays in the eye to be focused in front of the retina instead of on it.

41.An object is located at 30.0 cm from a converging mirror with a radius of curvature of 10.0 cm. At what distance from the mirror will the image be formed?

42.An object is located at 30.0 cm from a converging mirror with a radius of curvature of 10.0 cm. If the object is 4.0 cm tall, how tall is its image?

43. A diverging mirror with a focal length of -5.0 cm produces an image of an object located 15.0 cm from the mirror. What is the distance of the image from the mirror?

44. A diverging mirror with a focal length of -5.0 cm produces an image of an object located 15.0 cm from the mirror. What is the magnification?

45. An object 8.0 cm high is 18 cm from a converging lens having a focal length of 10 cm. How far is the image from the lens?

46. An object 8.0 cm high is 18 cm from a converging lens having a focal length of 10 cm. How tall is the image?

47. A diverging lens has a focal length of -4.0 cm. If an object is placed 8.0 cm from the lens, how far from the lens is the image?

48. The speed of light in a liquid is 2.25 x 10*8 m/s. What is the refractive index of the liquid?

49. Light travels from air into water (n=1.33). If the angle of incidence is 30 degrees, what is the angle of refractions?

50.Light travels from crown glass(n=1.52) into air (n=1.0). The angle of refraction in air is 60 degrees, what is the angle of incidence in glass?