Question

calculate the distance from the pinhole to an object that is 350 cm high and whose images is 10 cm high in a pinhole camera 20 cm long

Answer 1

Answer:

Correct option is

C

10 m

Given: A tree, which is 200 m away from the pinhole, produces an image of height 1cm, in a pinhole camera of width 20 cm

To find the height of the tree.

Solution:

According to the given criteria,

Object distance from pinhole, u=200m

Image distance from the pinhole, v=20cm=0.2m

Image height, h

i

=1cm=0.01m

Let tree height, i.e., object height be h

o

For pinhole camera,

h

i

=

u

v×h

o

⟹0.01=

200

0.2×h

o

⟹h

o

=

0.2

200×0.01

=10m

Hence the height of the tree is 10m.