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Lens Experiment Observation Summary

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Questions and Answers

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?

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$ (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?

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:

Virtual and erect (A) Signup and view all the answers

For a concave lens, if an object is placed at a distance greater than twice the focal length, the image formed is usually:

Virtual and diminished (C) Signup and view all the answers

If the object distance 'u' in a lens formula problem is negative, it indicates that the object is located:

In front of the lens (D) Signup and view all the answers

The magnification produced by a concave lens for an object placed at infinity will be close to:

-1 (D) Signup and view all the answers

In a lens formula problem, if the image distance 'v' is negative, it indicates that the image is formed:

On the same side as the object (B) Signup and view all the answers

'h < h''', object height < image height' refers to which type of image formation in lenses?

Real and diminished (D) Signup and view all the answers

What does a positive magnification value indicate about an image formed by a lens?

The image is larger than the object (C) Signup and view all the answers