Ray Optics and Optical Test

Result

Ray Optics and Optical Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Dispersion is the phenomenon of

A
splitting of light into electric and magnetic fields

B
variation of refractive index from glass to glass

C
scattering of light from various molecules

D
splitting of light into its component colours

Solution

In dispersion, light of different wavelength deviates by different angles, hence it splits into consituent colors.
Question 2
1 / -0

The bluish color predominates in a clear sky, since blue

A
has a shorter wavelength than red and is scattered much more strongly

B
has a shorter wavelength than red and is scattered much less strongly

C
is radiated much more strongly

D
has a longer wavelength than red and is scattered much more strongly

Solution

Molecules in clear sky are very small and according to Rayleigh's criteria of scattering for tiny particles, scattering ∝ 1/λ⁴ Since wavelength of blue colour components is smaller, hence it is scattered the most and clear sky appears blue.
Question 3
1 / -0

A far-sighted man who has lost his spectacles reads a book by looking through a small hole in the sheet of paper. Then

A
the hole produces an image of the letters at a longer distance

B
in doing so, the focal length of the eye lens is effectively decreased

C
in doing so, the equivalent focal length remains the same as with

D
in doing so, the focal length of the eye lens is effectively increased

Solution

Man is suffering from hypermetropia. The hole works like a convex lens.
Question 4
1 / -0

Binoculars is preferred to a terrestrial telescope to observe a cricket match, because

A
binoculars gives three dimensional view

B
telescope does not give erect image

C
binocular has shorter focal length

D
telescope has chromatic aberration

Solution

As both eyes are used for viewing, binoculars project a 3D image and provide a better in depth perception and a broader field of vision i.e., binocular lens gives the proper three dimensional image.