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Prepared by: learnloophq@gmail.com
Last edited 26 days ago by Learn LoopHQ.

Chapter: 06. Light

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B) Answer in one line
What is the main source of light during the day?
The Sun is the main source of light during the day.
What is the primary benefit of LED bulbs over CFLs in terms of environmental impact?
The primary benefit of LED bulbs over CFLs in terms of environmental impact is that LEDs do not contain mercury vapour, making them eco-friendly.
Why does a transparent object cast no shadow?
A transparent object casts no shadow because light passes through it completely without being obstructed.
On which specific moon phase does a lunar eclipse occur?
A lunar eclipse occurs only on a full moon night.
What is the ratio of the size of the image to that of the object known as?
The ratio of the size of the image to that of the object is known as magnification.
Explain why the color of an opaque object does not affect the color of its shadow.
The color of an opaque object does not affect the color of its shadow because a shadow is an absence of light, appearing dark regardless of the object’s color.
What is the main health risk associated with mercury vapour emitted from broken CFLs?
The main health risk associated with mercury vapour emitted from broken CFLs is its strong impact on organs such as the brain, lungs, and kidneys.
How does increasing the distance between the object and the pinhole affect the image size?
When the distance between the object and the pinhole is increased, the size of the image formed decreases.
Why do we usually not see the shadow of a flying kite or bird on the ground?
We usually do not see the shadow of a flying kite or bird because the Sun is very large compared to these objects, and they are too far from the ground for their shadows to be distinctly visible.
What is the alignment of the Sun, Earth, and Moon during a lunar eclipse?
During a lunar eclipse, the Sun, the Earth, and the Moon are in a straight line, with the Earth positioned between the Sun and the Moon.
What is the purpose of blackening the inside of a pinhole camera during its construction?
The inside of a pinhole camera is blackened to avoid any unwanted reflection of light.
What specific condition must be met for a total lunar eclipse to occur, regarding the Moon’s position in Earth’s shadow?
For a total lunar eclipse to occur, the Moon must be totally within the umbra region of the Earth’s shadow.
Give one real-world observation that demonstrates rectilinear propagation of light.
The light coming from a cinema projector or car headlights appearing to take a straight path demonstrates rectilinear propagation of light.
What term describes an image that can be viewed but cannot be obtained on a screen?
An image that can be viewed but not obtained on a screen is called a virtual image.
What are the three necessary conditions for the formation of a shadow?
The three necessary conditions for shadow formation are a source of light, an opaque object, and a screen or surface to receive the shadow.
How can a non-luminous object like an iron rod be made luminous temporarily?
A non-luminous object can be made luminous temporarily by heating it to a very high temperature.
When is a shadow shortest during the day?
A shadow is shortest at noon during the day.
Why does a bigger pinhole lead to a blurred image in a pinhole camera?
A bigger pinhole leads to a blurred image because it acts like multiple small pinholes, each producing an overlapping image, resulting in an indistinct appearance.
Briefly explain why a solar eclipse should not be viewed directly with naked eyes.
A solar eclipse should not be viewed directly with naked eyes because harmful ultraviolet rays from the Sun’s corona can severely damage the retina of the eyes and cause permanent blindness.
Does the shape of the pinhole affect the image formed by a pinhole camera?
No, the shape of the pinhole does not affect the image formed by a pinhole camera.
What is an eclipse in terms of natural shadows?
An eclipse is a natural phenomenon where the Earth or the Moon casts a shadow on the other celestial body, or blocks the Sun’s light, due to their specific alignment.
What is the difference between transparent and opaque objects regarding light passage?
Transparent objects allow light to pass through completely, while opaque objects do not allow any light to pass through.
Why might the Moon appear as a dull red disc even during a total lunar eclipse?
Even during a total lunar eclipse, the Moon may appear as a dull red disc because some light scattered from the Earth’s atmosphere reaches the Moon.
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