Wave Optics Test

Result

Wave Optics Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What is the wavelength and speed of reflected light?

A
589 nm, 3 × 10⁸m/s

B
590 nm, 3 × 10⁸m/s

C
582 nm, × 10⁸m/s

D
599 nm, 3 × 10⁸m/s

Solution

There is no change in speed of light and wave length when a wave gets reflected from a given surface.
Question 2
1 / -0

Shape of the wave front of light diverging from a point source is

A
spherical

B
hyperboloid

C
conical

D
plane

Solution

When light diverges from a point source, it moves in the form of the diverging spherical wavefront.
Question 3
1 / -0

Shape of the wavefront of light, emerging out of a convex lens, when a point source is placed at its focus is

A
spherical

B
conical

C
plane

D
hyperboloid

Solution

The rays of light becomes parallel after passing through a convex lens if the object is placed at focus. The shape of wavefront is plane as wavefront is perpendicular to rays.
Question 4
1 / -0

The shape of the wavefront of the portion of the wavefront of light from a distant star intercepted by the earth is

A
conical

B
hyperboloid

C
spherical

D
plane

Solution

Stars are very far away from earth. Near the star the shape is spherical but by the time its light reaches earth, the portion of the wavefront is plane due to increase in radius.
Question 5
1 / -0

The refractive index of glass is 1.5 which of the two colors red and violet travels slower in a glass prism?

A
both red and violet travel faster at the same speed

B
both red and violet travel slower at the same speed

C
red component of white light travels slower than the violet component

D
violet component of white light travels slower than the red component

Solution

The refractive index and wavelength are inversely related.

The wavelength of violet is least in the visible region so it bends the most.

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Re-Attempt Weekly Quiz Competition

Wave Optics Test - 7

Result

Wave Optics Test - 7

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SHARING IS CARING

Question 1

589 nm, 3 × 108 m/s

590 nm, 3 × 108 m/s

582 nm, × 108 m/s

599 nm, 3 × 108 m/s

Solution

Question 2

spherical

hyperboloid

conical

plane

Solution

Question 3

spherical

conical

plane

hyperboloid

Solution

Question 4

conical

hyperboloid

spherical

plane

Solution

Question 5

both red and violet travel faster at the same speed

both red and violet travel slower at the same speed

red component of white light travels slower than the violet component

violet component of white light travels slower than the red component

Solution

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589 nm, 3 × 10⁸m/s

590 nm, 3 × 10⁸m/s

582 nm, × 10⁸m/s

599 nm, 3 × 10⁸m/s