An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?

In the microscope, the eyepiece lens merely acts as?

In comparing the camera and the human eye, the film of the camera function as the?

The property of the eye known as its power of accommodation is controlled by the

Which of the following is NOT a component of a slide projector?