Concave and convex lenses experimental questions: (Based on the lab experiment b

Question

Concave and convex lenses experimental questions:

(Based on the lab experiment below the questions):

A) What happened when you moved the lens too far away from the object? Knowing the difference between real and virtual images, explain why you think this happens.

B) What kind of image did you view on the screen in Part 2?

C) Explain why you need the screen to view the image in this case.

D) How is the orientation of the image (right-side-up or upside-down) helpful for determining the type of image?

Exp:

1. Look through the concave lens at a number of objects, such as your ruler. Note whether the object appears larger or smaller.

2. Look through the convex lens, keeping the lens less than 10 cm away from any objects. Now move the lens farther away gradually, and note what happens to your view.

Part2:

1. Find an area in your room or home with a bright window. Try to dim the inside lights in the area so that the window provides most of the light—it helps if you can use a curtain to limit the amount of light coming in. 2. Hold the white paper in front of your eyes in an area that is not directly lit by the window. Using your other hand, hold the convex lens in front of the paper so that it is between the window and the paper, with your eyes on the other side. 3. Try to form an image of the window on your “screen” by changing the distance between the lens and the paper—this should occur when the lens is between 10 cm and 20 cm from the paper. Can you make a sharp image?

Explanation / Answer

A)

As you can see, moving the object further from the lens causes the image to move closer to the lens and become smaller. If we move the object further and further away, the image will get smaller and smaller. The image's location will move closer and closer to the focal point. If the object were very very far away, like the sun, then the light would be focused to a point - the focal point.

B)

Hold a lens at arm's length towards the window. Hold a piece of paper in the other hand and find the place between the lens and your head where there is a clear image of the window on the paper. You are looking at that image through the paper.

C)

This image can only be seen if a screen is kept at the point of intersection of rays(sharp image).If any screen is not kept then we are not able to see the image formed by meeting of rays.Whereas in case of virtual image we don't need any screen .Our eyes sense the rays coming (appear to be coming) from image source and we see image.

D)

Both images should have the same orientation even though they appear in different locations.

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