Illumination

Energy radiated continuously in the form of lighting waves is called

The luminous flux emitted in unit solid angle by a uniform point source having a luminous intensity of 1 candela is called

The illumination of a surface is

The principle of working of a high pressure mercury vapour lamp is that

Although the average efficiency of a 400W high pressure mercury vapour lamp is high, its main disadvantages are

Founded the wave theory of light

If a mirror is used to reflect light, the reflected light angle is _____ as the incident angle.

Dispersion is used to describe the

Luminance efficiency is minimum for a

An object farther from a converging lens than its focal point always has a/an _____ image.

An object nearer to a converging lens than its focal point always has a/an _____ image.

The depth of an objects submerged in a transparent liquid

Total internal reflection can occur when light passes from one medium to another

The brightness of light source is called its luminous intensity, whose unit is

Luminous efficiency is least for a

The minimum illumination recommendation for reading is

The solid angle subtended by a hemisphere about its center is

The gas inside the inner discharge tube of a sodium vapor lamp is

A lamp produces an illumination of 10 lux at a point 10 m directly below it. What is its luminous intensity?

This is a lighting system wherein the percentage of upward and downward brightness is the same.