Optics Answers

Why does a soap film exhibit different colours

You can calculate how far the moon is away ( assuming yu set your laser to stun , so yu dont blow up the moon ) the speed of light is 3 x 10[sup]8[/sup] m/s . When the moon is at apogee , the laser would take 2.7 seconds for it to leave earth , reflect off the moon , and return back to earth. knowing this , calculate the distance to the moon. ( hint* - your answer should be in meters )

Why do we observe colours in case of thin films?

Ages ago lenses of a certain type were called “firing glasses.” What could they be used for?

Find the location of the image if an object 2 cm in height is 5.0 cm in front of a concave mirror of focal length 10.0 cm. How large is the image ?

Image of an object in water having ripples look elongated. Explain

You and a friend are playing a game of squirt-gun tag in a maze. Suddenly you see your friend's image in a small planar mirror (see illustration). You take a shot over the barrier in front of you and find that your friend is just at the end of the 7.0 m range of your squirt gun. If you are 4.0 m from the point of reflection of the light ray, how far from the point of reflection of the light ray is your friend?

Light of wavelength 450 nm is incident normally on a diffraction grating with 300 lines per millimeter. How many orders of diffraction maxima can be obtained? =)

A. 7
B. 8
C.14
D.15

Thanks!

What do you understand by total internal reflection?

I wonder how much the refractive index of a metal changes when a thin film (< 10 nm) is formed on the metal surface. An example is a 10 nm copper oxide (Cu2O) film formed on a copper surface. Is there any good reference literature on the topic?