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Ray Optics and Optical Instruments · Question 67

AIPMT 2004MCQMedium📈 Topic in 12% papers+4−1
1

A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from

  1. two points propagating in two different non-parallel directions
  2. two points propagating in two different parallel directions
  3. one point propagating in two different directions
  4. one point propagating in the same directions

Answer

(2) two points propagating in two different parallel directions

Solution

green > red, the two colours bend by different amounts at the first face they travel along different paths in the glass and reach the second face at two different points.

For a rectangular (parallel-sided) slab, each emergent ray is parallel to the incident ray (lateral shift only).

Both emergent rays are parallel to the incident beam and hence parallel to each other, but they come out from two different points.

Answer: (2)

AIPMT 2004

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2

An equiconvex lens is cut into two halves along (i) XOX′ and (ii) YOY′ as shown in the figure. Let f, f', f'' be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively. Choose the correct statement from the following [figure]

  1. f' = f, f'' = 2f
  2. f' = 2f, f'' = f
  3. f' = f, f'' = f
  4. f' = 2f, f'' = 2f
AIPMT 2003
3

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

  1. become zero
  2. become infinite
  3. become small, but non-zero
  4. remain unchanged
AIPMT 2003
4

A bulb is located on a wall. Its image of the same size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance d ahead of the second wall, then the required focal length will be

  1. only d4
  2. only d2
  3. more than d4 but less than d2
  4. less than d4
AIPMT 2002
5

For the given incident ray as shown in the figure, for total internal reflection of this ray, the required refractive index of the prism will be [figure]

  1. 3+12
  2. 2+12
  3. 32
  4. 76
AIPMT 2002
6

Optical fibres are based on

  1. total internal reflection
  2. less scattering
  3. refraction
  4. less absorption coefficient
AIPMT 2001
7

A ray of light travelling in air has wavelength , frequency n, velocity v and intensity I. If this ray enters into water then these parameters are ', n', v' and I' respectively. Which relation is correct from following?

  1. = '
  2. n = n'
  3. v = v'
  4. I = I'
AIPMT 2001
8

A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is

  2. 3 m
  3. 6 m
  4. 4 m
AIPMT 2001
9

A bubble in glass slab ( = 1.5) when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is

  1. 3.75 cm
  2. 3 cm
  3. 10.5 cm
  4. 2.5 cm.
AIPMT 2000
10

A tall man of height 6 feet, wants to see his full image. Then required minimum length of the mirror will be

  1. 12 feet
  2. 3 feet
  3. 6 feet
  4. any length
AIPMT 2000
11

A plano-convex lens ( = 1.5) has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering

  1. 10 cm
  2. 20 cm
  3. 15 cm
  4. 25 cm
AIPMT 2000

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