Since the refractive index is less at beam boundary, the ray at the edges of the beam move faster compared to the axis of beam. Hence the beam converges.

The speed at which the light travels in vacuum is $ 3 \times 10^8 m/s$

• The spots are often oval, rather than round. That's because the sunlight is hitting the ground at an angle and the round sun images are stretching out to make ovals.
• It's perpendicular to the sun's rays, and the spots should become round. 
•  Hence option B is the right answer

When the rays of light starting from a point travel in different directions, then the collection of such rays is termed as a divergent beam of light.

When the rays of light coming from different directions meet at a point, then the collection of such rays is termed as a convergent beam of light.

Ray light is defined as each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.

A broad stream of light is called a beam of light.
A beam is defined as a ray or stream of light or other radiation, as gamma rays, electrons, or subatomic particles.

When the rays of light starting from a point travel in various directions then collection of such rays is called divergent beam of light

If a parallel beam of light fall on a converging mirror or lens then they will also pass through focus i.e. all the rays will meet at a point of a convergent beam.

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.

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.

Answer is A.

When we put any object in between the light source it forms a shadow of that object. The closer the object is to the source of the light, the more light it blocks out, so its shadow is bigger. But if the object is further away, it does not block out much light, and so the shadow is smaller.
Therefore, for the shadow of the ceiling fan to be formed on a wall opposite to the door, the electric bulb must be positioned on the wall having the door.

Option A $\rightarrow $ All light is electromagnetic wave. This option is correct as EM light does not need any medium to travel like EM wave.