A converging beam of rays is incident on a diverging lens. Having passed though the lens the rays intersect at a point 15cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5cm closer to the lens. The focal length of the lens is:

(1) -10cm                                   

(2) 20cm

(3) -30cm                                   

(4) 5cm

Subtopic:  Lenses |
 61%
From NCERT
NEET - 2011
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A ray of light traveling 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 values 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 |
 58%
From NCERT
NEET - 2010
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A lens having focal length f and aperature of diameter d forms an image of intensity I. Aperture of diameter d2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively

(a) f and 14                                      (b) 3f4and I2

(c) f and 3I4                                     (d) f2and I2

Subtopic:  Lenses |
 58%
From NCERT
NEET - 2010
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The speed of light in media M1 and M2 is 1.5×108 m/s and 2.0×108 m/s respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is

(1) equal to sin-123

(2) equal to or less than sin-135

(3) equal to or greater than sin-134

(4) less than sin-123

Subtopic:  Total Internal Reflection |
 85%
From NCERT
NEET - 2010
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A ray of light is incident on a \(60^\circ\) prism at the minimum deviation position. The angle of refraction at the first face (ie, incident face) of the prism is:
1. zero
2. \(30^\circ\)
3. \(45^\circ\)
4. \(60^\circ\)

Subtopic:  Prisms |
 73%
From NCERT
NEET - 2010
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Two thin lenses of focal length f1 and f2 are in contact and coaxial. The power of the combination is 

(1) f1f2                   

(2) f2f1

(3) f1-f2f1f2               

(4) f1+f2f1f2

Subtopic:  Lenses |
 86%
From NCERT
NEET - 2008
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A thin prism of angle 15° made of glass of refractive index μ1=1.5 is combined with another prism of glass of refractive index μ2=1.75. The combination of the prism produces dispersion without deviation. The angle of the second prism should be 

(1) 7°                                             

(2) 10°

(3) 12°                                             

(4) 5°

Subtopic:  Prisms |
 78%
From NCERT
NEET - 2011
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Which of the following is not due to total internal reflection?

(1) Difference between apparent and real depth of a pond

(2) Mirage on hot summer days

(3) Brilliance of diamond

(4) Working of optical fibre

Subtopic:  Total Internal Reflection |
 85%
From NCERT
NEET - 2011
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A biconvex lens of refractive index 1.5, has a radius of curvature of magnitude 20 cm. Which one of the following options describes best the image formed of an object of height 2 cm placed 30 cm from the lens?

(1) Virtual, upright, height=0.5 cm

(2) Real, inverted, height=4 cm

(3) Real, inverted, height=1 cm

(4) Virtual, upright, height=1 cm

Subtopic:  Lenses |
 59%
From NCERT
NEET - 2011
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A rod of length \(10\) cm lies along the principal axis of a concave mirror of focal length \(10\) cm in such a way that its end closer to the pole is \(20\) cm away from the mirror. The length of the image is:
1. \(10\) cm 2. \(15\) cm
3. \(2.5\) cm 4. \(5\) cm
Subtopic:  Reflection at Spherical Surface |
 60%
From NCERT
NEET - 2012
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