Questions 1. What is meant by a virtual image? Under what conditions will a conc
ID: 1782041 • Letter: Q
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Questions 1. What is meant by a virtual image? Under what conditions will a concave mirror give a virtual 3. What kind of mirror does a dentist use when he/she wants to observe a magnified image of a 4. In a projection lantern at least half the light from the lamp is headed in the wrong direction image? tooth, and where does he locate it for this purpose? where would you put a mirror and what type would you use, to return this light to the vicinity oft 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 mirrors principal focus? (c) on his eyeball? At that moment, where should the observer be? 6. Approximate the focal length of a plane mirror. How do the Eqs. 3 and 4 look like under this circumstance?Explanation / Answer
1. A virtual image is one in which the reflected rays do not meet but only appear to meet when produced backwards. It can not be taken on a screen and it is always erect. It always forms behind the mirror.
In case of concave mirror, when the object is inside the focal length, it forms a virtual image.
2. Dentists use concave mirror for teeth enlargement view. They place the mirror very close to the patient, so that patient's teeth lie under focal length and thus produce virtual erect and magnified image.
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