Free Printable wave optics

1.

what is the shape of the wavefront on earth for sunlight?

a)

spherical

b)

cylindrical

c)

plane

d)

none of these

2.

diffraction is waves bending because of

a)

edges of a slit or thin object

b)

speed of wave changes

c)

dark matter

d)

gravity

3.

You use a green laser (wavelength 532 nanometers) in order to measure the thickness of a hair. The formula for Diameter is lambda divided by the sine of theta. (but since theta is small we can use opposite over adjacent). x = 1.7 cm and d = 180 cm. What is the diameter (D)?

a)

56329 x10 -8 meters

b)

56329 x 10-9 meters

c)

56.329 microns

d)

56329 x10-7 meters

4.

The intensity of light for the interference of two light wave with a phase difference of $\phi$ is

a)

$I=4I_o\cos\frac{\phi}{2}$

b)

$I=4I_o\cos^2\ \frac{\phi}{2}$

c)

$I=4I_o\cos\phi$

d)

$I=4I_o^2\cos\phi$

5.

For Young's double slit interference distance of $n^{th}$ bright fringe from the center of the screen is

a)

$\frac{n\lambda D}{d}$

b)

$\frac{n\lambda d}{D}$

c)

$\left(n+\frac{1}{2}\right)\ \frac{\lambda D}{d}$

d)

$\left(n+\frac{1}{2}\right)\ \frac{\lambda d}{D}$

6.

The figure shows the diffraction pattern by a single slit which has a slit size of 0.017 mm and is placed 80 cm from the screen. The light used has a wavelength of 600 nm. what is the width of the central bright band?

a)

5.65 cm

b)

7.21 cm

c)

6.65 cm

d)

8.34 cm

7.

The figure shows a monochromatic light of wavelength $\lambda$ being incident onto a single slit. The slit size is a. What is the value of d in terms of $\lambda$ ?

a)

$\lambda$

b)

2 $\lambda$

c)

3 $\lambda$

d)

4 $\lambda$

8.

A wave front is an imaginary surface where

a)

all particles lying on this vibrate in opposite phase

b)

some particles in same phase and some in opposite phase

c)

all particles lying on this vibrate in same phase

d)

none of these

9.

consider the diffraction pattern for a small pinhole. as the size of hole is increased then the central bright _________

a)

the size decreases

b)

the size increases

c)

no change

d)

no effect

10.

consider the diffraction pattern for a small pinhole. as the size of hole is increased then the intensity of central bright _________

a)

no change

b)

decreases

c)

increases

d)

non of these

11.

draw the distance verses intensity graph in case of interference.

12.

what is the basic difference in refraction and diffraction ?

4 lines

13.

YOUNGS DOUBLE SLIT EXPERIMENT first performed in air and then in a medium other than air. it is found that 8 th bright fringe in the medium lies where 5 th dark fringe lies in air . find the value of refractive index of medium?

4 lines

14.

4 lines

wave optics

Total questions: 14

Worksheet time: 27mins

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