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Ray Optics and Optical Instruments · Question 55

JEE Main 2025 (Online) 29th January Morning ShiftMCQMedium📈 Topic in 48% papers+4−1
1

Let u and v be the distances of the object and the image from a lens of focal length f. The correct graphical representation of u and v for a convex lens when |u| > f, is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(4) [figure]

Solution

Lens formula (u negative for a real object): 1v - 1u = 1f

v = ufu+f; with u = -|u|: v = |u|f|u|-f (positive, real image, for |u| > f)

As |u| f: v (the curve rises steeply near the dashed line |u| = f)

As |u| : v f (the curve flattens out to a small constant value)

dvd|u| = - f2(|u|-f)2 < 0, so v decreases continuously as |u| increases (rectangular hyperbola (|u|-f)(v-f) = f2).

This is shown only in graph (4).

Answer: (4)

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2

Two light beams fall on a transparent material block at point 1 and 2 with angle 1 and 2, respectively, as shown in figure. After refraction, the beams intersect at point 3 which is exactly on the interface at other end of the block. Given : the distance between 1 and 2, d = 4 3 cm and 1 = 2 = -1 ( n22n1 ), where refractive index of the block n2 > refractive index of the outside medium n1, then the thickness of the block is cm. [figure]

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3

At the interface between two materials having refractive indices n1 and n2, the critical angle for reflection of an em wave is 1C. The n2 material is replaced by another material having refractive index n3 such that the critical angle at the interface between n1 and n3 materials is 2C. If n3 > n2 > n1; n2n3 = 25 and 2C - 1C = 12, then 1C is :

  1. -1 ( 16n1 )
  2. -1 ( 13n1 )
  3. -1 ( 56n1 )
  4. -1 ( 23n1 )
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4

A thin prism P1 with angle 4 made of glass having refractive index 1.54, is combined with another thin prism P2 made of glass having refractive index 1.72 to get dispersion without deviation. The angle of the prism P2 in degrees is

  1. 1.5
  2. 16/3
  3. 3
  4. 4
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5

A hemispherical vessel is completely filled with a liquid of refractive index . A small coin is kept at the lowest point (O) of the vessel as shown in figure. The minimum value of the refractive index of the liquid so that a person can see the coin from point E (at the level of the vessel) is . [figure]

  1. 32
  2. 32
  3. 3
  4. 2
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6

A concave mirror produces an image of an object such that the distance between the object and image is 20 cm. If the magnification of the image is -3, then the magnitude of the radius of curvature of the mirror is :

  1. 3.75 cm
  2. 15 cm
  3. 7.5 cm
  4. 30 cm
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7

In a long glass tube, mixture of two liquids A and B with refractive indices 1.3 and 1.4 respectively, forms a convex refractive meniscus towards A. If an object placed at 13 cm from the vertex of the meniscus in A forms an image with a magnification of -2, then the radius of curvature of meniscus is :

  1. 23 cm
  2. 43 cm
  3. 13 cm
  4. 1 cm
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