phy 101 GDB solution fall 2017 last date 9 feb 2018

  i.            Can you see a virtual image? 

      ii.            Can you photograph a virtual image? 

    iii.            Can you project a virtual image onto a screen? 

    iv.            Is it necessary to project a real image onto a screen to see it? 

1. 
   
2. 
   
3. 
   

4. Solution (1)

5. A virtual image can only be seen by looking into the optics and cannot be projected. As a concrete example, you can project a view of the other side of the room using a convex lens, and cannot do so with a concave lens.

6. Solution (2)

2. Yes. Any camera that's capable of photographing actual objects is also capable of photographing real and virtual images. If you stand in front of a mirror and take a photo, you'll get a photo of the virtual image. 
3. Solution (3)

3. In optics, a virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen. 

4. Solution (4)

5. Yes it is necessary to project a real image onto a screen to see it. 

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