Please answer ALL questions 1,3,4,5,6. Questions 1. What is meant by a virtual i

Question

Please answer ALL questions 1,3,4,5,6.

Questions 1. What is meant by a virtual image? Under what conditions will a concave mirror give a virtual image? What kind of mirror does a dentist use when he/she wants to observe a magnified image ofa tooth, and where does he locate it for this purpose? In a projection lantern at least half the light from the lamp is headed in the wrong direction; where would you put a mirror and what type would you use, to return this light to the vicinity of the filament, this time headed in the right direction? As one approaches a concave mirror from a large distance, his image may vanish from his sight. For this effect to be most complete, where should the image be (a) at infinity? (b) at the mirror's principal focus? (c) on his eyeball? At that moment, where should the observer be? 3. 4. 5. 6. Approximate the focal length of a plane mirror. How do the Eqs. 3 and 4 look like under this circumstance? rn =-= Eqn 4: , d

Explanation / Answer

1)

A virtual image is an optical image formed from the apparent divergence of light rays from a point, as opposed to an image formed from their actual divergence.

A virtual image is one that the light does not pass through. Simplest example: your image in a mirror.

Concave mirror gives a virtual image when the object is placed between the focal point f and the mirror.

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