Chapter 16 – Optics
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One plano-convex and one plano-concave lens of same radius of curvature ‘R’ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of 1 is μ1 and that of 2 is μ2, then the focal length of the combination is :
18
Nov
One plano-convex and one plano-concave lens of same radius of curvature ‘R’ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of 1 is μ1 and that of 2 is μ2, then the focal length of the combination is : In figure the [...]
A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distances x1 and x2(x1>x2) from the lens. The ratio of x1 and x2 is
18
Nov
A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distances x1 and x2(x1>x2) from the lens. The ratio of x1 and x2 is A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is [...]
A ray of light AO in vacuum is incident on a glass slab at angle 60∘ and refracted at angle 30∘ along OB as shown in the figure. The optical path length of light ray from A to B is :
18
Nov
A ray of light AO in vacuum is incident on a glass slab at angle 60∘ and refracted at angle 30∘ along OB as shown in the figure. The optical path length of light ray from A to B is : A ray of light AO in vacuum is incident on a glass slab at [...]
A thin convex lens L (refractive index = 1.5) is placed on a plane mirror M. When a pin is placed at A, such that OA = 18 cm, its real inverted image is formed at A itself, as shown in figure. When a liquid of refractive index μ1 is put between the lens and the mirror, The pin has to be moved to A’, such that OA’ = 27 cm, to get its inverted real image at A’ itself. The value of μ1 will be
18
Nov
A thin convex lens L (refractive index = 1.5) is placed on a plane mirror M. When a pin is placed at A, such that OA = 18 cm, its real inverted image is formed at A itself, as shown in figure. When a liquid of refractive index μ1 is put between the lens and [...]
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A thin convex lens L (refractive index = 1.5) is placed on a plane mirror M. When a pin is placed at A ,
as shown in figure. When a liquid of refractive index μ1 is put between the lens and the mirror ,
its real inverted image is formed at A itself ,
such that OA = 18 cm ,
such that OA' = 27 cm ,
The pin has to be moved to A' ,
to get its inverted real image at A' itself. The value of μ1 will be ,
A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is :
18
Nov
A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is : A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold [...]
A convex lens (of focal length 20 cm) and a concave mirror, having their principal axes along the same lines, are kept 80cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of 30cm to the left of the convex lens, its image remains at the same position even if the concave minor is removed. The maximum distance of the object for which this concave mirror, by itself would produce a virtual image would be
18
Nov
A convex lens (of focal length 20 cm) and a concave mirror, having their principal axes along the same lines, are kept 80cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of 30cm to the left of the convex lens, [...]
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A convex lens (of focal length 20 cm) and a concave mirror ,
are kept 80cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of 30cm to the left of the convex lens ,
by itself would produce a virtual image would be ,
having their principal axes along the same lines ,
its image remains at the same position even if the concave minor is removed. The maximum distance of the object for which this concave mirror ,
In figure, the optical fiber is l = 2 m long and has a diameter of d=20μm. If a ray of light is incident on one end of the fiber at angle θ1=40^∘ , the number of reflections it makes before emerging form the other end is close to : (refractive index of fiber is 1.31 and sin40^∘=0.64)
18
Nov
In figure, the optical fiber is l = 2 m long and has a diameter of d=20μm. If a ray of light is incident on one end of the fiber at angle θ1=40^∘ , the number of reflections it makes before emerging form the other end is close to : (refractive index of fiber is [...]
An upright object is placed at a distance of 40 cm in front of a convergent lens of focal length 20 cm. A convergent mirror of focal length 10 cm is placed at a distance of 60 cm on the other side of the lens. The position and size of the final image will be
17
Nov
An upright object is placed at a distance of 40 cm in front of a convergent lens of focal length 20 cm. A convergent mirror of focal length 10 cm is placed at a distance of 60 cm on the other side of the lens. The position and size of the final image will be [...]