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Questions and Answers
What is the sign convention for the focal length of a concave lens?
What is the sign convention for the focal length of a concave lens?
- Zero
- Negative (correct)
- Positive
- Depends on the situation
Which formula expresses the relationship between object distance (u), image distance (v), and focal length (f) for lenses?
Which formula expresses the relationship between object distance (u), image distance (v), and focal length (f) for lenses?
- $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$
- $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$ (correct)
- $\frac{1}{f} + \frac{1}{v} = \frac{1}{u}$
- $\frac{1}{f} - \frac{1}{v} = \frac{1}{u}$
When solving problems relating to lenses using the lens formula, what should one take proper care of?
When solving problems relating to lenses using the lens formula, what should one take proper care of?
- Temperature of the room
- Signs of different quantities (correct)
- Shape of the lens
- Color of the object
In a concave lens, the nature of the image formed is usually:
In a concave lens, the nature of the image formed is usually:
For a concave lens, if an object is placed at a distance greater than twice the focal length, the image formed is usually:
For a concave lens, if an object is placed at a distance greater than twice the focal length, the image formed is usually:
If the object distance 'u' in a lens formula problem is negative, it indicates that the object is located:
If the object distance 'u' in a lens formula problem is negative, it indicates that the object is located:
The magnification produced by a concave lens for an object placed at infinity will be close to:
The magnification produced by a concave lens for an object placed at infinity will be close to:
In a lens formula problem, if the image distance 'v' is negative, it indicates that the image is formed:
In a lens formula problem, if the image distance 'v' is negative, it indicates that the image is formed:
'h < h''', object height < image height' refers to which type of image formation in lenses?
'h < h''', object height < image height' refers to which type of image formation in lenses?
What does a positive magnification value indicate about an image formed by a lens?
What does a positive magnification value indicate about an image formed by a lens?
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