Tag: physics

Lamp, tube light and CFL emit light radiation in visible spectrum when they glow. So they are the sources of light.

All the three statements are true that light is observed when switching on the torch, sunlight is observed in early morning and a beam of light can be observed through a hole.

Candle, sun and bulb emit light radiation when they glow, so they are the sources of light. But black body do not emit light and thus is is not a source of light.

Sun and moon are the natural sources of light whereas tube light and bulb are the man made sources of light.

Since in case of reflection or reflection of light rays, the image formation is the meeting/crossing of light ray's through a point.

When a convergent beam of light passes through a glass slab, the light rays are refracted towards the normal upon entering and away from the normal upon exiting. This causes the point of convergence to shift further away from the slab.

Because the Sun is at a very large distance from the Earth, the rays reaching the Earth's surface are essentially parallel.

Length of shadow decreases and will be zero.
"Angle of elevation" is the angle between the thing being referenced and the horizontal. So, when the sun rises the angle of elevation increases and your shadow becomes shorter. When the sun is directly overhead, you don't have a shadow and the angle of elevation is 90, which is the greatest angle. So, the closer to midday, the shorter the shadow and the greater the angle of elevation.