Convex mirror is used in rear view mirror of vehicles; so that the driver can see the traffic coming from behind. The field of view is widest in case of a convex mirror, which enables it to show a wider area from behind.

Correct Option: B

Convex mirror is used in rear view mirror of vehicles; so that the driver can see the traffic coming from behind. The field of view is widest in case of a convex mirror, which enables it to show a wider area from behind.

Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.

Correct Option: B

Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.

For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).

Correct Option: B

For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).

The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states that the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.

Correct Option: D

The first law of thennodynamics is a version of the law of conservation of energy for thermodynamic systems. It states that the change in the internal energy of a system is equal to the heat added to the system plus the work done on the system.

An electron microscope is a microscope that uses a beam of accelerated electrons as a source of illumination. Because the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, the electron microscope has a higher resolving power than a light microscope and can reveal the structure of smaller objects.

Correct Option: B

An electron microscope is a microscope that uses a beam of accelerated electrons as a source of illumination. Because the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, the electron microscope has a higher resolving power than a light microscope and can reveal the structure of smaller objects.