Question

In aerial mapping a camera uses a lens with 100 em focal length. The height at which the airplane must
fly, so that the photograph of a Ikm long strip on the ground fits exactly on the 20cm long filmstrip of
camera, is :
Pls answer fast will mark brainliest

Answer 1

Answer:

Explanation:

Focal length, f = 1 m,

size of object, h  

1

​  

=1000 m, size of image, h  

2

​  

=0.2 m

image is real, so

−  

h  

1

​  

 

h  

2

​  

 

​  

=  

u

v

​  

⇒v=−2×10  

−4

u

∵  

f

1

​  

=  

v

1

​  

−  

u

1

​  

 

1=−  

2×10  

−4

u

1

​  

−  

u

1

​  

⇒u=−5000m or u=−5km