1. What is a source of light?
2. How do you see non-luminous objects?
3. How are shadows produced?
4. State the position of the Sun, Moon and
Earth during: (i) a solar eclipse (1) a lunar
eclipse
5. From which portion on the Earth can a total
solar eclipse be seen?
6. What kind of image is formed by a pinhole
camera?
7. On what principle does the action of a
pinhole camera depend?
8. How does a change in the distance of the
object from a pinhole camera affect the size
of the image?
9. What happens when a ray of light falls on a
plane mirror?
Answers
Explanation:
1. Natural sources of light include the sun, stars, fire, and electricity in storms. ... Flashlights, table lamps, neon signs, and televisions are some sources of artificial light.
2.How are non luminous objects visible to eye ?
A . Non-luminous objects give away light.
B . Non-luminous objects reflect the light falling on them.
C . Non-luminous objects disperse the light falling on them.
D . None of the above.
3.Shadows are made by blocking light. Light rays travel from a source in straight lines. If an opaque (solid) object gets in the way, it stops light rays from traveling through it. ... The size and shape of a shadow depend on the position and size of the light source compared to the object.
4.the rest I cannot do sorry Really accepted as sorry!!
Answer:
1)Natural sources of light include the sun, stars, fire, and electricity in storms. ... Flashlights, table lamps, neon signs, and televisions are some sources of artificial light. Most of the lights that are man-made need an energy source, such as electricity or batteries, to produce light.
2)Non-luminous objects reflect the light falling on them and the reflected light are sensed by the eye and thus we are able to see non-luminous objects.
3) Shadows are made by blocking light. Light rays travel from a source in straight lines. If an opaque (solid) object gets in the way, it stops light rays from traveling through it. ... The size and shape of a shadow depend on the position and size of the light source compared to the object.
4)When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse.
5)Once the Sun is totally eclipsed, the Sun's corona can be seen shining in all directions around the Moon. This is a spectacular sight because the only time the Sun's corona can be seen is during a total solar eclipse.
6)A pinhole camera is a simple camera without a lens but with a tiny aperture (the so-called pinhole) – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.
7)Pinhole cameras rely on the fact that light travels in straight lines – a principle called the rectilinear theory of light. This makes the image appear upside down in the camera.
8)When you place an object in front of the pinhole camera, a clear image is formed on the screen. The image formed on the pinhole camera is inverted. ... If the distance between the pinhole and screen is reduced, the size of the image will decrease and the image will become bright since the light spreads over a small area.
9)When a ray of light falls normally (or perpendicular) on the surface of a plane mirror, it means that angle of incidence is 0o. ... Thus, the light ray will be reflected back along the same path.