Question

A piece of black tape is now placed over the upper half of the lens. Which of the follow is true. a. Only the lower half of the object (i.e., the arrow tail) will show on the screen. b.Only the upper half of the object (i.e., the arrow head) will show on the screen. c.The whole object will still show on the screen.

Answer 1

Answer:

Option C

Explanation:

As per the lens equation -  

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

where f is the  length of focus of the lens  

and V is the distance of the image  

and U is the distance of the object

In case of lenses covered with tape, will have no impact on the distance of the image and the object as focal length is property of  glass of lens.  

And  also

 $M = \frac{h_i}{h_o}$$\frac{h_i}{h_o} = \frac{-v}{u}$

Since there is no change in the distance of the image and the object due to   tape on lens, the image and object height will remain same.  

Thus, option C is correct