Thin lenses Flashcards
What type of power is a convex lens
posistive power
(vexes bring u posistivity)
What are the three shape of a convex len
Plano convex
Biconvex
Convex meniscus
What type of power is a concave lens
negative power
What are the three shapes of a concave lens
Plano concave
Biconcave
Concave meniscus
When is a lens considered thin
When thickness is small and has a negligible effect on power
What is effective power and when is it used
The vergence at any plane behind a lens to produce same focus point as the orignal lens on incidnent
Used when it is a different lens and the distance changes
What is correcting lens power and when is it used
The resultant vergenceon the same point when the lens was displaced from its orignal posisiton
Used when it is same lens but difstance change
What is the difference in prismatic effect of prism and thing lens
Prism has the same deviation fo any position of incident ray
Thin lens has varying derivation with increasing deviation towards the peripheral
what is the prismatic effect at the optical centre of a lens
No prismatic effect
What is the prismatic effect on biconvex (thick boi)
Image deviates to the base, when decentered downward the effect is simlar to a base down prism and the image appears to move up
Prism base to base at optical axis
What is the prismatic effect on negative lens
When decentered downward and view thr top protion, effect simliar to base up prism and image appears to move down
Prism apex to apex at optic axis
What is beding of a lens
changing surface radii while maintaing same total power
