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)
Sahay Sir > Question Answers > 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)
A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like
18
Nov
A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like In figure the number of reflections it makes before emerging form [...]
A transparent solid cylindrical rod has a refractive index of 2/3–√ .It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is:
18
Nov
A transparent solid cylindrical rod has a refractive index of 2/3–√ .It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is: In figure the [...]
A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8m behind the first car is overtaking the first car at a relative speed of 15 ms. The speed of the image of the second car as seen in the mirror of the first one is
18
Nov
A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8m behind the first car is overtaking the first car at a relative speed of 15 ms. The speed of the image of the second car as seen in the mirror of the first one is In figure [...]
Let the x-z plane be the boundary between two transparent media. Media 1 in z ≥ 0 has refractive index of 2–√ and medium 2 with z < 0 has a refractive index of 3–√. A ray of light in medium 1 given by the vector A→=63–√iˆ+83–√jˆ−10kˆ in incident on the plane of separation. The angle of refraction in medium 2 is
18
Nov
Let the x-z plane be the boundary between two transparent media. Media 1 in z ≥ 0 has refractive index of 2–√ and medium 2 with z < 0 has a refractive index of 3–√. A ray of light in medium 1 given by the vector A→=63–√iˆ+83–√jˆ−10kˆ in incident on the plane of separation. The [...]
A beaker contains water up to a height h1 and kerosene of height h2 above water so that the total height of (water + kerosene) is (h1+h2) . Refractive index of water is μ1 and that of kerosene is μ2 . The apparent shift in the position of the bottom of the beaker when viewed from above is
18
Nov
A beaker contains water up to a height h1 and kerosene of height h2 above water so that the total height of (water + kerosene) is (h1+h2) . Refractive index of water is μ1 and that of kerosene is μ2 . The apparent shift in the position of the bottom of the beaker when viewed [...]
A thin convex lens made from crown glass (μ=3/2)has focal length f. When it is measured in two different liquids having refractive indices 4/3 and 5/3. It has the focal lengths f1 and f2 respectively. The correct relation between the focal length is
18
Nov
A thin convex lens made from crown glass (μ=3/2)has focal length f. When it is measured in two different liquids having refractive indices 4/3 and 5/3. It has the focal lengths f1 and f2 respectively. The correct relation between the focal length is In figure the number of reflections it makes before emerging form the [...]
A diverging lens with magnitude of focal length 25cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is.
18
Nov
A diverging lens with magnitude of focal length 25cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is. In figure the number of reflections it makes before emerging form the other end [...]
The eye can be regarded as a single refracting surface is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 and 1.34. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus.
18
Nov
The eye can be regarded as a single refracting surface is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 and 1.34. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus. In figure the number of reflections it makes [...]
A plano convex lens of refractive index μ1 and focal length f1 is kept in contact with another plano concave lens of refractive index μ2 and focal length f2. If the radius of curvature of their spherical faces is R each and f1 = 2f2, then μ1 and μ2 are related as :
18
Nov
A plano convex lens of refractive index μ1 and focal length f1 is kept in contact with another plano concave lens of refractive index μ2 and focal length f2. If the radius of curvature of their spherical faces is R each and f1 = 2f2, then μ1 and μ2 are related as : In figure [...]
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 [...]