Q5 of 25 Page 11

Why does the sky appear dark instead of blue to an astronomer? ( CBSE 2016)

The sky appears dark instead of blue to an astronaut because, there is no atmosphere in the outer space so there is no scattering of light. And because there is no scattering of light so no color is scattered. Thus, the sky appears dark to the astronaut.

More from this chapter

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3

Name the:

a. Component of white light that deviates the least.


b. Component of white light that deviates the most, while passing through a glass prism. ( CBSE 2005)

 4

A person suffering from an eye defect uses lenses of power – 1D. Name the defect he is suffering from and the nature of lens used. ( CBSE 2015)

 6

A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5 dioptre.

What is the focal length of the lens required for correcting


(i) distant vision, and (ii) near vision. ( CBSE 2007)

 7

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
( CBSE 2006)