Optical fibre is based on:
1. Total internal reflection
2. Less scattering
3. Refraction
4. Less absorption coefficient

Subtopic:  Total Internal Reflection |
 93%
From NCERT
AIPMT - 2001
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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.

Subtopic:  Lens Makers' Formula |
 70%
From NCERT
AIPMT - 2003
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A biconvex 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:

1. \(f' = f,f'' =2f\) 2. \(f' = 2f, f''=f\)
3. \(f' =f, f''=f\) 4. \(f'=2f, f''=2f\)
Subtopic:  Lenses |
 81%
From NCERT
AIPMT - 2003
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A ray of light travelling in the air has wavelength λ, frequency n, velocity v, and intensity I. If this ray enters into water then these parameters are λ', n', v' and I' respectively. Which relation is correct?
1.  λ = λ′
2.  n = n′
3.  v = v′
4.  I = I′

Subtopic:  Refraction at Plane Surface |
 83%
From NCERT
AIPMT - 2001
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A disc is placed on the surface of a pond which has a refractive index of 53. A source of light is placed 4 m below the surface of the liquid. Find The minimum radius of a disc so that light does not come out from it.
1.  ∞
2.  3 m
3.  6 m
4.  4 m

Subtopic:  Total Internal Reflection |
 78%
From NCERT
AIPMT - 2001
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In a compound microscope, the magnification is \(95\), the distance of the object from the objective lens is \(\frac{1}{3.8}~\text{cm}\) and the focal length of the objective is \(\frac{1}{4}~\text{cm}\). What is the magnification of the eyepiece when the final image is formed at the least distance of distinct vision?
1. \(5\)
2. \(10\)
3. \(100\)
4. none of the above

Subtopic:  Simple & Compound Microscope |
From NCERT
AIPMT - 1999
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A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of a convex lens. If the distance between parallel walls is 'd' then the required focal length of the lens placed in between the walls is:

1. Only \(\frac{\mathrm{d}}{4}\)
2. Only \(\frac{\mathrm{d}}{2}\)
3. More than \(\frac{\mathrm{d}}{4}\)but less than \(\frac{\mathrm{d}}{2}\)
4. Less than or equal to \(\frac{\mathrm{d}}{4}\)

Subtopic:  Lenses |
From NCERT
AIPMT - 2002
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If refractive index of a prism is \(\mathrm{cot(A/2)}\), then the minimum angle of deviation is:
1. \(180^{\circ}-A\)
2. \(180^{\circ}-2A\)
3. \(90^{\circ}-A\)
4. \((A/2)\)

Subtopic:  Prisms |
 87%
From NCERT
AIPMT - 1999
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For the given incident ray as shown in the figure, in the condition of the total internal reflection of this ray, the minimum refractive index of the prism will be:

       

1. 3+12

2. 2+12

3. 32

4. 76

Subtopic:  Total Internal Reflection |
 55%
From NCERT
AIPMT - 2002
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The refractive index of the material of a prism is 2 and its refracting angle is \(30^{\circ}\). One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is:
1. \(60^{\circ}\)
2. \(0^{\circ}\)
3. \(30^{\circ}\)
4. \(45^{\circ}\)

Subtopic:  Prisms |
 79%
From NCERT
AIPMT - 2004
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