Question

keywords of convex lens , concave lens and prism ​

Answer 1

Answer:

convex lens - converging lens

concave Lens - diverging lens

prism - varifocal lens

hope this helps you...

Answer 2

Answer:

Lens

• Lens is like a series of prisms

• Straight through at the centre

• Sharper wedge angles further out

• More focusing further out

• Snell’s law applied to get the lens operation.

Prism

• Consider light entering a prism

• At the plane surface perpendicular light is unrefracted

• Moving from the glass to the slope side

light is bent away from the normal of the slope

• Using Snell's law

n sin(ϕ ) = n

′ sin(ϕ′)

1 sin( ) 1.75sin( 30 ) 0.875 o ϕ′ = =

o ϕ′ = arcsin( 0.875 ) = 61

Types of Lenses

Types of Lenses

Convex

• (a) Biconvex or equiconvex

• (b) Planoconvex

• (c) positive meniscus.

Concave

• (d) biconcave or equiconve

• (e) Planoconcave

• (f) negative meniscus

• Primary and secondary focal points very dependent on type

• Planoconvex/Panloconcave easiest to make

• Two surface lenses about twice the price