Name: Solar and Lunar Eclipses
Uploaded: 2019-07-19
Duration: 7 min 27 s
Description: Solar and lunar eclipses are celestial phenomena that occur when the Sun, Moon and Earth align in a way. Watch this video to understand the phenomenon.

Question

Match the following

a. Opaque object i. The innermost part of a shadow

b. Firefly ii. The outermost part of a shadow

c. Umbra iii. Bioluminescence

d. Penumbra iv. Dim shadow

e. Translucent v. Dark shadow

Accepted Answer

(a) - (v)

The dark area formed when light is blocked by an opaque object kept in its path is called shadow. An opaque object forms a very dark shadow.

(b) - (iii)

Some living organism produces light due to chemical reaction in their bodies. When the enzyme called luciferase chemically reacts with oxygen in the air. The process of emission of light is called bioluminescence. For example, firefly, squid.

(c) - (i)

Umbra is the darkest and innermost part of a shadow. Umbra is formed when the object completely blocks the light source.

(d) - (ii)

The region from where the observer experiences partial darkness of the shadow is called the penumbra.

(e) - (iv)

The material that partially allow the light to pass through them are called translucent materials. Example of translucent material are butter paper, some curtain materials etc.

Match the following

a. Opaque object i. The innermost part of a shadow

b. Firefly ii. The outermost part of a shadow

c. Umbra iii. Bioluminescence

d. Penumbra iv. Dim shadow

e. Translucent v. Dark shadow

Important Questions on Light

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