Corrective lens effect Wearing corrective lenses with a power of +1.5 D will make your… a)nearpoint larger b)farpoint larger c)nearpoint smaller d)farpoint.

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Presentation transcript:

Corrective lens effect Wearing corrective lenses with a power of +1.5 D will make your… a)nearpoint larger b)farpoint larger c)nearpoint smaller d)farpoint smaller

Stars Stars are a)very big b)very small

Magnifying glass  Image produced by simple magnifier is:  upright  bigger Therefore the lens must be __ and the image must be __. a)converging, real b)converging, virtual c)diverging, real d)diverging, virtual

Magnifying glass Jenna’s nearpoint is 30 and she uses a lens with focal length +3cm (+33 diopters – quite strong). What angular magnification does she get if she holds the lens and object so that her eye is relaxed? a)10 b)11 c)27 d)33

Magnifying glass Jenna’s nearpoint is 30 and she uses a lens with focal length +3.3cm (almost as strong a lens). What angular magnification does she get if she holds the object 3 cm from the lens? a)10 b)11 c)27 d)33

Magnifying glass Jenna knows she can get a maximum angular magnification of 8X from a particular simple magnifier. What magnification will she get if she uses the same lens so that her eye is relaxed? a)4 b)7 c)10 d)16