Question

$\huge\bigstar\underline\mathfrak{Question:-}$
1) difference between shadow and image.
2) define :-

= luminous objects
= rectilinear propagation
= mirror
= penumbra
= umbra

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Answer 1

[1]

★Difference between a shadow and image:-

$\sf\red{Shadow:-}$

• A shadow is formed when light is blocked by an opaque object.

• A shadow depicts only the outline of the object.

• A shadow does not show Lateral inversion of the object.

• Shadows have no colour. They are black or grey.

$\sf\red{Image:-}$

• An image is formed by the reflection of light.

• An image is an exact replica of the object in all detail.

• An image shows Lateral inversion or left right reversal of the object.

• An image is of the same colour as the object.

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[2]

★Define the following terms:-

1. Luminous objects :- objects which emit light on their own are called as luminous objects.

2. Rectilinear propagation :- The phenomenon of light travelling in a straight line is called as rectilinear propagation.

3. Mirror :- Any highly polished surface from which regular reflection takes place, is known as mirror.

4.Penumbra :- the region of partial darkness which surrounds the umbra region is called as penumbra.

5. Umbra :- The total dark region of the shadow is called as umbra.

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