Colour in a colour television is produced by a combination of three basic colours, they are :

If the magnification produced by a lens is +2, then the image is :

In order to avoid sunlight, which of the following colour combination for an umbrella is most appropriate?

A microscope may be a combination of:

Which one of the following colours may be obtained by combining green and red colours ?

What is the magnification produced by a concave lens of focal length 10 cm, when an image is formed at a distance of 5 cm from the lens?