Consider the following electric circuit :

The current in the above electric circuit is :

A microscope may be a combination of :

For a human eye, where u is the distance of an object from the eye, f is the focal length of the lens and v is the distance of image from the eye, which is the correct schematic graph?

Which of the following statements with regard to the phenomenon of the primary rainbow formation by water droplets is/are correct?

1. It involves refraction and one internal reflection of sunlight.

2. It involves refraction of sunlight only.

3. It is formed as the inner bow.

4. It may involve more than one internal reflection as well as refraction of sunlight.

Select the answer using the code given below :