Ray Optics and Optical Test

Result

Ray Optics and Optical Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is used in optional fibres?

A
Total internal reflection

B
Scattering

C
Refraction

D
Diffraction
Question 2
1 / -0

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen, then

A
half the image will disappear

B
intensity of the image will increase

C
no image will be formed

D
complete image will be formed

Solution

Image formed will be complete when upper half of lens is blocked. Intensity of the image will decrease as the incident rays from upper half are cut off.
Question 3
1 / -0

When a ray of light enters a glass slab from air,

A
its frequency increases

B
its wavelength increases

C
its wavelength decreases

D
neither wavelength nor frequency changes

Solution

The energy of the light is related to the frequency. When the light enters the medium, the apparent speed of light changes. If the frequency changed, the energy would not be conserved. The wavelength changes to balance the change in speed. When light enters from air to glass (from rarer to denser medium), its speed decreases as a consequence its wavelength also decreases.