An object 5 cm long and a pencil 10 cm long are placed in front of a pinhole camera such that their images have the same length.Find the ratio of the distances of object from the pinhole to that of the pencil?

Q. In a pinhole camera, the image of height 6 cm is formed at a distance of 10 cm. If the object is situated at a distance of 5 cm, the height of the object is ___ cm.

Q. A pinhole camera is a camera such that light from an object simply passes through a tiny hole into a dark box, and an image is projected onto the other side of the box. When a pinhole camera is used to produce an image of a distant object, what are the characteristics of the image?

Q.

In a pinhole camera, the image of height 6 cm is formed at a distance of 10 cm. If the object is situated at a distance of 5 cm, the height of the object is:

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

Q. Two pinholes $1.5\text{mm}$ apart are placed in front of a source of light of wavelength $5.5\times {10}^{-5}\text{cm}$ and seen through a telescope with its objectives stopped down to a diameter of $0.4\text{cm}.$ Find the maximum distance from the telescope at which the pinholes can be resolved.