Practice MCQ Questions and answers on Physics-GK

Lens is made up of flint glass.

A basic microscope is made up of two converging lenses. The first lens creates a real image which serves as the object for the second lens, and the image created by the second lens is the one a viewer sees. The final image is magnified, virtual and is inverted compared to the original object.

Microscopes that are used to view metal surfaces are scanning tunneling microscopes.

Soil cannot be used for making lenses.

The illuminating powers of two sources are compared by a photometer.

In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. In a rainbow, raindrops in the air act as tiny prisms. Light enters the raindrop, reflects off of the side of the drop and exits. In the process, it is broken into a spectrum just like it is in a triangular glass prism.

The information of brilliant colors in a thin soap film is a consequence of the phenomena of multiple reflection and interference.

Optic fibres are used in endoscopy.

Optical filters are devices that selectively transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), fluorescence microscopy, spectroscopy, clinical chemistry, colour stage lighting, etc.

Parabolic mirrors are used in car headlights.