Question
Download Solution PDFTo obtain a virtual erect image by reflection from a concave mirror of focal length 20 cm, the object should be placed :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 'between 0-20 cm'.
Key Points
Concave mirror:
- If the reflection takes place from the inner surface of a spherical mirror, then the mirror is called a concave mirror.
- It is also known ahh
- Depending on the point of the object:
- The image may be real or virtual.
- Image may be erect or inverted.
- image may be magnified or diminished.
- they are used widely, for example- Shaving mirrors, Doctor's head mirrors, ophthalmoscopes, Headlights, solar furnaces, etc.
Explanation:
The focal length of a concave mirror = 20 cm
The image formed by concave mirror = Virtual erect image
- The Virtual Image is formed when the object is placed between the principal focus and the pole.
- Also, Focal length is the distance between the pole and the principal focus.
- Here, The focal length is given as 20 Cm, so the most correct answer is from 0 cm to 20 cm.
Thus, the correct answer is 0-20cm.
Additional Information Here is the ray diagram formed by a concave mirror at different position:
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