* True or False:- 1- The unknown lens to be used in the Application part has a n

Question

* True or False:-

1- The unknown lens to be used in the Application part has a negative focal length.

2- The +100mm focal length lens that will be studied in this experiment can only be used to form enlarged images.

3- In image formation by a lens, the image distance is the distance between an object and its image.

* Multiple choices:-

4- For an object 5.78cm from a lens, an image distance -2.35cm is measured. Please calculate the focal length of the lens, and use the sign convention to identify whether it is a converging or diverging lens. Refer to equation 1 in lab manual and sign convention in manual addendum.

a- Converging. b- Diverging. c- It can be either converging or diverging.

5- What is a virtual object?

a- An Image. b- An Object that is burnt. c- A Ghost that can be seen but is not tangable.

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Explanation / Answer

(1) The unknown lens may have negative or positive focal lenghts.

so, the statement is false.

(2)

The size of the images depends on the distance of the object from the lens. The magnification does not depend on the focal lenght. so, the statement is false.

(3)

image distance is the distance betwee the lens and the image.

(4)

the focal lenght of the lens is,

f=u*v / (u+v) = 5.78*(-2.35) / (5.78-2.35) = -3.96 cm

the lens is diverging. the correct option is (b).

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