Answer key

Prepared by: learnloophq@gmail.com

Last edited 26 days ago by Learn LoopHQ.

Chapter: 06. Light

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A) Fill in the blanks

A shadow formed by a point source of light consists of only the umbra region.

The basic property of light travelling in a straight line is called rectilinear propagation of light.

Objects that emit light of their own are called luminous objects.

Non-luminous objects become visible only when they reflect light produced by a luminous object.

A lunar eclipse occurs when the Earth comes in between the Sun and the Moon.

A pinhole camera is a simple device based on the principle of rectilinear propagation of light.

The central darkest part of a shadow is called the umbra region.

Wood and metals are examples of opaque objects.

Spectacles and spherical lenses are examples of transparent objects.

If the size of the pinhole is increased, the image formed will be blurred.

An eclipse is commonly known as the formation of shadows in nature.

During the night, we can see objects because of light given out by artificial sources such as bulbs and tubelights.

Longer shadows are formed in the morning and evening.

The temperature range at which an iron wire becomes luminous upon heating is between 600° C and 800° C.

Light is a form of energy that causes the sensation of vision.

The image formed by a pinhole camera is always real and inverted.

A solar eclipse always occurs on a new moon day.

Pierre Janssen discovered the element helium during a total solar eclipse.

Frosted glass and butter paper are examples of translucent objects.

A dark patch formed behind an opaque object when it blocks light is called a shadow.

Objects that allow light to pass through them completely are called transparent objects.

A solar eclipse occurs when the Moon lies between the Sun and the Earth.

During an annular solar eclipse, only the rim of the sun is visible as a bright ring.

The penumbra is the region of partial darkness in a shadow.

Only a part of the light passes through translucent objects.

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