Name ____________________________ID#______________________________Section____________________________Light: Color and Spectra Pre-labHand in this pre-lab at the beginning of the Light and Spectra Lab.Reading: The Essential Cosmic Perspective, Sections 5.1 - 5.2or A Beginner’s Guide to the Universe, Sections 2.3 – 2.5Planets, stars and galaxies are so distant from the earth that we must study them using only light. In this lab, you will continue to investigate the nature and behavior of light. You will learn the basics of how light interacts with matter, using prisms and filters for your experiments. You will also learn the basics of spectroscopy using a diffraction grating, and apply your knowledge to identify an unknown gas using only light.Imagine you are sitting outside on a sunny day with a light bulb in your hand. The light bulb is not plugged in to any power source, but you can still see it. Explain how you can see the bulb (what is emitting the light you see?).You now walk into the shade under a tall tree. You notice that you can still see the light bulb in your hand. Why can you still see the bulb while standing in the shade?As an experiment, you place a white t-shirt and a black t-shirt in direct sunlight. A few minutes later, you touch each of the shirts. What happened to the temperature of the shirts? Why is there a difference between the two shirts?rev. 061606You are sitting in a dark closet with a small lamp and a mirror. You turn the lamp on, andyou can see your hand in the mirror. Draw a ray diagram showing the path of the light bywhich you see your hand.If you turn the lamp off, can you see your hand? Are you emitting any kind of invisible light?Figure 5.9 in Bennett or Figure 2.19 in Chaisson show some energy level transitions for hydrogen. It says the visible emission line spectrum comes from electrons falling to the first excited state. What type of light is emitted by electrons falling to the ground state?Can we see the light emitted by hydrogen atoms when they make a transition to the ground state? Why or why