A ray of light travelling in a transparent medium of refractive index μ falls on a surface separating the medium from the air at an angle of incidence of 45 °. For which of the following value of μ, the ray can undergo total internal reflection?

1. μ=1.33

2. μ=1.40

3. μ=1.50

4. μ=1.25

Subtopic:  Total Internal Reflection |
 63%
From NCERT
AIPMT - 2010
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A lens having focal length \(f\) and aperture of diameter d forms an image of intensity \(I\). An aperture of diameter \(\frac{d}{2}\)in central region of lens is covered by a black paper. The focal length of lens and intensity of the image now will be respectively:
1. \(f\) and \(\frac{I}{4}\)
2. \(\frac{3f}{4}\) and \(\frac{I}{2}\)
3. \(f\) and \(\frac{3I}{4}\)
4. \(\frac{f}{2}\) and \(\frac{I}{2}\)

Subtopic:  Lenses |
 58%
From NCERT
AIPMT - 2010
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Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is:

1. f1f2

2. f2f1

3. f1+f2f1f2

4. None of the above

Subtopic:  Lenses |
 87%
From NCERT
AIPMT - 2008
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A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of a focal length of \(10\) cm. The diameter of the sun is \(1.39\times10^9\) m and its mean distance from the earth is \(1.5\times10^{11}\) m. What is the diameter of the sun's image on the paper?
 

1. \(9.2\times10^{-4}\) m 2. \(6.5\times10^{-4}\) m
3. \(6.5\times10^{-5}\) m 4. \(12.4\times10^{-4}\) m
Subtopic:  Lenses |
 58%
From NCERT
AIPMT - 2008
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A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up, to the surface of the liquid and moves along its surface (see figure). 
                
How fast is the light traveling in the liquid?

1. \(1.8 \times 10^8 \mathrm{~m} / \mathrm{s} \) 2. \(2.4 \times 10^8 \mathrm{~m} / \mathrm{s} \)
3. \(3.0 \times 10^8 \mathrm{~m} / \mathrm{s} \) 4. \(1.2 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Subtopic:  Total Internal Reflection |
 63%
From NCERT
AIPMT - 2007
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The frequency of a light wave in a material is 2×1014 Hz and the wavelength is 5000 Å. The refractive index of the material will be:

1. 1.40

2. 1.50

3. 3.00

4. 1.33

Subtopic:  Refraction at Plane Surface |
 77%
From NCERT
AIPMT - 2007
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A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and a refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?

1. 1 cm upward

2. 4.5 cm downward

3. 1 cm downward

4. 2 cm upward

Subtopic:  Simple & Compound Microscope |
 54%
From NCERT
AIPMT - 2006
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A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dioptres of the combination is:

1. 25

2. 50

3. infinite

4. zero

Subtopic:  Lenses |
 59%
From NCERT
AIPMT - 2006
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Pick the wrong statement in the context with a rainbow.

1. Rainbow is a combined effect of dispersion, refraction, and reflection of sunlight.
2. When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
3. The order of colors is reversed in the secondary rainbow.
4. An observer can see a rainbow when his front is towards the sun.
Subtopic:  Total Internal Reflection |
 74%
From NCERT
NEET - 2019
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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be the angle of refraction?

1. \(90^{\circ}\)
2. \(180^{\circ}\)
3. \(0^{\circ}\)
4. equal to the angle of incidence
Subtopic:  Total Internal Reflection |
 74%
From NCERT
NEET - 2019
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