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## Physics library

### Course: Physics library>Unit 15

Lesson 2: Mirrors

# Virtual image

Virtual Image. Created by Sal Khan.

## Want to join the conversation?

• wait.. why is reality a simulation in our brains
• oh i see,. perceived reality is such a strange concept but i get what your saying. does that mean that I could perceive to see a star millions of light years away and in my simulated reality it is visible but in actual fact it has died/exploded and disappeared by the time the light reaches me on earth
• Does anyone know how to calculate the minimum size of a mirror so that you can see your entire body?
• Not really 'half of your body' but 'half of your angular height', which depends on how far would the mirror be located apart from you (the farther away, the smaller mirror would do). Assuming the mirror is straight. Convex mirror could be even smaller and concave would need to be larger.
• At , why did you draw the incident ray at that angle? Can you draw it any way or direction you want? Do you randomly pick at what angle you want it to go?
• Yes, there will be light travelling in essentially all directions
• if there is no side behind the mirror then way rays passes the mirror ?
• They don't pass the mirror. Because of they way they reflect off of the surface of the mirror they look as if they come from a point behind the mirror, this is why it is called a virtual image it doesn't actually exist.
• as an object is moved from a great distance to the focus of a spherical mirror the image moves away from the mirror.what kind of mirror is it-convex or concave
• Why are real images turned upside down?
• I think you need to look at the lens videos to understand it. I would try to explain in text, but it's better with a diagram. But when you hear the word "real" that means it is upside down and the reason we don't perceive things as upside down is because our brain compensates for the image and turns it right side up.
• why does a mirror flip left/right and not up/down
• A mirror doesn't flip left and right. What is on your right in the real world is on the same side in the mirror. Here is a good video on this: https://www.youtube.com/watch?v=vBpxhfBlVLU
• Real images (images on opposite side of an object) are always inverted. Virtual images (images on the same side of the object) are always erect/ upright
• You mixed up the sides. Real images (images on the same side of the object) are always inverted. Virtual images (images on opposite side of an object) are always erect/ upright.
• Can someone explain the difference between real and virtual image clearly? What does it mean by 'a real image can be obtained on a screen ' ?