Wave Optics Test

Result

Wave Optics Test - 14

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Weekly Quiz Competition

Question 1
4 / -1

The interference fringes formed by a thin oil film on water are seen in yellow light of sodium lamp . We find the fringes

A
coloured

B
black and white

C
yellow & black

D
coloured without yellow
Question 2
4 / -1

In young’s double slit expt., angular width of a fringe formed on a distant screen is 1^o. The wavelength of light used is 6000 Å . What is the separation between the slits ?

A
0.0172 cm

B
0.0086 cm

C
0.0344 mm

D
none of these

Solution
Question 3
4 / -1

Which of the following is NOT essential for two sources of light in Young’s double slit experiment to produce a sustained interference ?

A
Equal wavelength

B
Equal Intensity

C
Constant phase relationship

D
Equal frequency
Question 4
4 / -1

The velocity of light in diamond (v_d), in glass (v_g) and in water (v_w) is such that

A
v_w > v_g > v_d

B
v_d > v_g > v_w

C
v_d > v_w > v_g

D
v_w > v_d > v_g

Solution
Question 5
4 / -1

Two waves having the intensities in the ratio of 9 : 1 produce interference. The ration of maximum to minimum intensity is equal to

A
10.8

B
9 : 1

C
4 : 1

D
2 : 1

Solution
Question 6
4 / -1

Ratio of intensities of two waves is given by 4 : 1. Then ratio of the amplitude of the two waves is

A
2 : 1

B
1 : 2

C
4 : 1

D
1 : 4

Solution
Question 7
4 / -1

The correct relation between the size of the obstacle and wavelength of light in order to observe the diffraction event is

A

B

C

D

Solution
Question 8
4 / -1

Diffraction pattern is obtained using red light. What will happen if it is replaced by violet light?

A
Bands will disappear

B
Bands will become narrow

C
Bands will get spaced apart

D
Bands will remain unchanged.
Question 9
4 / -1

The limit of resolution of eye is approximately

A
1^o angle

B
1’ angle

C
1 mm

D
1 cm
Question 10
4 / -1

A plane wave of wavelength 6250 Å is incident normally on a slit of width 2 × 10^-2 cm. The width of the principal maximum on a screen distant 50 cm will be

A
312.5 × 10^-3 cm

B
31.25 × 10^-3 cm

C
312 cm

D
312.5 × 10^-3 mm

Solution