6. Light rays from a point source located at the focal point of a convex lens wi

Question

6. Light rays from a point source located at the focal point of a convex lens will pass through the lens and:

(a) pass through the focal point on the other side of the lens.

(b) diverge from each other.

(c) be parallel to each other and the optical axis.

(d) converge to a point behind the focal point on the other side of the lens.

7. A convex lens with a 10 cm focal length is used to create an image of an object on a screen that sits 25 cm behind it. If the screen is moved toward the lens, what will happen to the image on the screen?

(a) The image on the screen will completely disappear.

(b) An image of an object closer to the lens will appear.

(c) An image of an object farther from the lens will appear.

(d) The image will not change.

8. What is an aperture?

(a) A special lens used in cameras.

(b) The distance between two lenses in a camera.

(c) A fancy name for hole.

(d) 1 over the focal length.

9. If the refractive index of a convex lens is increased, what will happen to its focal length?

(a) It will get longer.

(b) It will get will not change.

(c) It will get shorter.

10. What type of lens is used in a magnifying glass?

(a) Concave.

(b) A combination of convex and concave.

(c) Convex.

Explanation / Answer

6 (c) be parallel to each other and the optical axis.

7 (c) An image of an object farther from the lens will appear.
8 (c) A fancy name for hole.

9 (c) It will get shorter.

10 (c) Convex.

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