Light Shadows a...

In the pinhole camera, the light rays from the source are moving through the pinhole and incident on the white screen. This is due to :

Which stick is likely to form the $$SHORTEST$$ shadow on the ground?

Which surface will  reflect most of the light falling on them ?

Which of the following can never form a circular shadow?

The phenomenon related to the reflection of light is 

A student observes a tree given in Fig. through a pinhole camera. Which of the diagrams given in Fig. (a) to (d) depicts the image seen by her correctly?

Which of the following is/are not always necessary to observe a shadow?

If we are able to see anything clearly through an object, then such an object is said to be a ________ object

A man of height h walking away from a lamp post finds his shadow to be equal to his height when he is at a distance x from the lamp post. If the height of the lamp post is H, then x is