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Science 8 6.2 Extending Human Vision p. 216-225 Name: _____________________ Date: ____________ Block: ____ Brainstorm some reasons you think that human vision might need to be extended? Look to p. 216 for ideas. _________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ How to Bring an Image into Focus Describe how a clear image is formed. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ What is focussing and why is it important? ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ Microscopes Compound light microscopes use __________ _________________ lenses to ___________________ small, close objects To ___________________ means to cause to look _________________ than the real size The object to be viewed is placed on a transparent slide and illuminated from _____________ The light passes by or ______________ the ___________ object on the ___________ and then ____________ through the __________________ lens The objective lens is a ________________ lens and produces an ___________________ image of the object The eyepiece lens is another ________________ lens that ___________________ the image again The final image can be ____________________ of times larger than the _______________ object Telescopes A telescope uses a ____________ or a concave ______________ to gather more of the light from ________________ objects As a result, objects appear much ________________ This allows the image to be ____________________ to reveal more detail To the right is a ____________________ telescope 1 Science 8 Name: _____________________ Date: ____________ Block: ____ Explain how a refracting telescope works _________________________________________________________________________ _________________________________________________________________________ _____________________________________________ _____________________________________________ To the right is a ___________________ telescope How is this type of telescope different from a refracting telescope? ____________________________________ ____________________________________________ How does this type of telescope work? _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ Binoculars Binoculars are actually _________ ____________________ __________________ mounted side by side These telescopes are shortened by placing ______________ inside that serve as _____________ __________________ Rather than travelling down the long ________ of a ______________________, the prisms reflect the light in binoculars back and forth inside a __________________ tube Cameras Describe how a camera works _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ How are wide-angle lenses and telephoto lenses used for cameras? _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ Cameras have Similarities to Human Eyes A camera and the human eye have many similarities The lens cap of the camera is similar to the human ________________ A diaphragm on a camera is similar to the ________ of the eye 2 Science 8 Name: _____________________ Date: ____________ Block: ____ Light passes through the __________ and forms an ___________________ image in both the _______ and the ______________ How is focussing different in the camera and the human eye? _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ What is at the back of a camera?________________________________________________ How is this structure similar to the rods and cones in our eyes? i.e. What function does it serve? _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ Lasers In laser light, all the light has the same _________________________, all the light rays are moving in the ____________ direction, and all of the _________________ and ____________________ are __________________ up Laser light can travel _______________ distances and can contain a lot of _____________ Laser light ________________ refract into a rainbow because it contains only ________ wavelength of light Laser Surgery Lasers are used for ____________________________________________________ ___________________________________________________________________ Describe some different ways that lasers can be used to correct vision _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ Optical Fibres An optical fibre is a simple way to __________________ light They are ___________________ glass fibres that can ________________ light from one place to another Almost _________ light is ___________ or ___________________ in optical fibres Total internal reflection is when all the light rays strike the ___________ of the fibre and are ____________________ back into it Optical fibres are used in medicine to transmit ________________ of the _____________ of a person’s body from a tiny ________________ at one end of the fibre optics cable to a ________________ at the other end What are some uses for fibre optics in telecommunications? _________________________________________________________________________ _________________________________________________________________________ 3 Science 8 Name: _____________________ Date: ____________ Block: ____ The Human Eye 4