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Refraction at Curved Surfaces

An equiconvex...

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An equiconvex lens of refractive index (3/2) and focal length 10cm is held with its axis vertical and its lower surface immersed in water (4/3).the upper surface being in air. At what distance from the lens will a vertical beam of parallel light incident on the lens be focused?

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Q. An equiconvex lens of refractive index

\frac{3}{2}

and focal length 10 cm is held with its axis vertical and its lower surface immersed in water(

μ

\frac{4}{3}

, the upper surface being in air.At wat distance from the lens ,will a vertical beam of parallet light incident on the lens be focused?

Q. An equiconvex lens of refractive index 1.5 and focal length 10 cm (in air) is placed on the surface of water

(μ = \frac{4}{3})

such that its lower surface is immersed in water but its upper surface is in contact with air outside. Principal axis is perpendicular to water. A beam parallel to its principal axis is incident on lens from air then

Q. Focal length of a thin convex lens is

30 c m

. At a distance of

10 c m

from the lens, there is a plane refracting surface of refractive index

3 / 2

. Where will the parallel rays incident on the lens converge?

Q. A parallel beam of light is incident on a lens of focal length 10 cm. A parallel slab of refractive index 1.5 and thickness 3 cm is placed on the other side of the lens. find the distance of the final image from the lens.

Q. A thin convex lens of refractive index

1.5

20 c m

focal length in air. If the lens is completely immersed in a liquid refractive index

1.6

, its focal length will be :

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