Free Printable Diffraction

1.

In, Fresnel type of diffraction

a)

Source at finite distance and screen at infinite distance

b)

Source and screen are at infinite distance

c)

Source at infinite distance and screen at finite distance

d)

Both source and screen are at a finite distance

2.

In Fraunhofer class of diffraction

a)

The source and screen are at infinite distance

b)

The source is at finite distance and screen is at infinite distance

c)

The source and screen are at a finite distance

d)

The source is at infinite distance and screen is at a finite distance

3.

The bending of light rounds the corners of an obstacle is called

a)

Diffraction

b)

Interference

c)

Polarization

d)

Refraction

4.

In which type of diffraction, diffracted light is collected by a lens in a telescope

a)

Fresnel's

b)

Fraunhoffer's

c)

Both

d)

None

5.

In single slit Fraunhoffer diffraction, the position of minima is given by

a)

$\theta=0$

b)

$a\ \sin\theta=\pm m\lambda\ where\ m=1,\ 2,3....$

c)

$a\sin\theta=\pm\ \frac{\left(2m+1\right)\lambda}{2}$

6.

The width of central maximum is directly proportional to the wavelength of light.

a)

True

b)

False

7.

In, plane transmission grating the position of principal maxima is given by

a)

$N\ \left(a+b\right)\sin\theta=\pm m\lambda,\ where\ m=\ 1,\ 2,\ 3,\ ....\ \left(N-1\right)$

b)

$\left(a+b\right)\sin\theta=\pm n\lambda,\ where\ n=0,\pm1,\ \pm2.....$

c)

$N\ \left(a+b\right)\ \sin\theta=\pm\frac{\left(2m+1\right)\lambda}{2},\ where\ m=1,\ 2,\ 3,.....$

8.

In plane diffraction grating, the angular width of principal maxima deceases as the rulings on grating increase.

a)

True

b)

False

9.

The Dispersive power of a grating increases with the increase in the number of lines on grating.

a)

True

b)

False

10.

The resolving power of a grating decreases with the increase in the number of lines on grating.

a)

True

b)

False

11.

Each slit has a width of 0.15 mm and the distance between their center is 0.75 mm. What are the missing spectra.

a)

3, 6, 9,..... order will be missing.

b)

2, 4, 6,..... order will be missing.

c)

5,10, 15,..... order will be missing.

d)

4,8, 12,..... order will be missing.

12.

In a grating spectrum, which spectral line in 4th order will overlap with 3rd order line of 0.5461 cm.

a)

0.4096 cm

b)

0.4422 cm

c)

0.5096 cm

d)

0.4069 cm

13.

What do you mean by the Rayleigh criterion?

a)

When the central maximum of one source coincides with the first minimum of the other.

b)

When the central maximum of one source overlap with the central maximum of the other.

c)

When the central maximum of one source overlap with the first minimum of the other.

Diffraction

Total questions: 13

Worksheet time: 7mins

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