Question

1. The distance from the center of a lens to the location where parallel rays converge or appear to converge is called the length. convergence O meeting O focal O None of the above

Answer 1

1)the distnace from the centre of a lens to thelocation where paarallel raus converge or appear to converge is called the----> focal length.

2)when the incomes rays are ---> parallel ,--the focal point and the image point are same.

3) A vitual ---image will not appear on a screen placed in the image plane.

4) Convex lens is thicker the center than at the edge.

6) negative

7)the manification of a lens is less than one when image issmaller than theobject.

8)the rays start out parallel tothe principle axsis for a converging lens passes therough the the focal point.

9) None of the above

10) with out bending

11) real image formed

12) false

13)

$Magnification = \frac{the ~ image~distance}{the~ object distance}=\frac{18}{22}=0.8$

14)

+ >f= u V f

where u, v is the distance of object and image repectively. and f is the focal length

here u=22 cm , v=18 cm

then  

            $\Rightarrow f=\frac{1}{\frac{1}{22}+\frac{1}{18}}=9.9 ~cm$

15) image

16) equal to