Question

1. How is a real image different from a virtual image? Why might it be difficult to measure the location of the virtual image? (2 points) 2. The figure below shows an object to the left of a converging lens and the resulting image to the right. On the diagram draw the three principal rays. (3 points) object near f far image The figure Above shows an object to the left of a converging lens and the resulting image to the right. On the diagram draw the marginal rays (similar to the PhET in your pre- assignment). (3 points)

Answer 1

A real image is formed when the rays of light after reflection or refraction actually meet at some point whereas a virtual inmage is formed when the rays of light after reflection or refraction appear to meet at a point. A real image can be formed in a screen but a virtual. Image can be only seen in the mirror. Virtual image is an image formed when the outgoing rays from a point on an object aways 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 so its location actual not easily measyred.