To form an achromatic combination, two lenses of focal length X and Y and dispersive power A and B respectively, are kept in contact. Which of the following is correct?

1.  A = C, B = C/2; X = 2Y

2.  A = C, B = C/2; X = -2Y

3.  A = C, B = 2C; X = 2Y

4.  A = C, B = 2C; X = -2Y 

Subtopic:  Lenses |
 65%
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In a glass (μ=1.5) sphere of radius 10 cm, there is an air bubble B at distance 5 cm from C. The distance of bubble from the surface of the sphere (i.e. point A) as observed from point P in the air will be

(1) 4.5 cm

(2) 20.0 cm

(3) 9.37 cm

(4) 6.67 cm

Subtopic:  Refraction at Curved Surface |
 61%
From NCERT
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A concave lens is made of three layers of glass of three different materials as shown in the furure. A point object is placed on its axis. Number of images of the object is -

1. 2

2. 3

3. 4

4. 1

Subtopic:  Lenses |
 53%
From NCERT
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An object is placed at a distance of 20 cm from the thin lens as shown in the figure. The points C1 and C2 denote centres of curvature. The magnification produced by the lens is (Refractive index of glass is 1.5)

1.  -2

2.  +2

3.  -1/2

4.  +1/2

 

Subtopic:  Refraction at Curved Surface |
 62%
From NCERT
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A lens forms image of a point object placed at distance 20 cm from it, just in front of the object at distance 4 cm from the object towards the lens. The power of lens is

(1) -2.25 D

(2) 1.75 D

(3) -1.25 D

(4) 1.4 D

Subtopic:  Lenses |
 76%
From NCERT
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A point object O is placed on the principal axis of the convex lens of focal length = 20 cm at a distance of 40 cm. The diameter of the lens is 10 cm. An eye is placed 60 cm to the right of lens and a distance below the principal axis. The maximum value of to see the image is-

1. Zero 

2. 2.5cm

3. 5cm

4.10cm 

Subtopic:  Lenses |
 56%
From NCERT
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If the wavelength of a ray of light from a source of lights is 3000 A0in air, then the wavelength of that ray of light in a liquid in which S is placed will be:

(1) 4000 A0

(2) 1500 A0

(3) 9000 A0

(4) 3500 A0

Subtopic:  Refraction at Plane Surface |
 85%
From NCERT
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A ray of light incident at an angle i is refracted at angle r into a glass slab of thickness t. The lateral displacement of the emergent ray is

1.  t sin icos r

2.  t sin i-rcos r

3.  t sin (i-r) cos r

4.  t sin i+rcos r

Subtopic:  Refraction at Plane Surface |
 87%
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Chromatic aberration is absent in

(1) Plano-convex lens

(2) Plano concave lens

(3) Concave mirror

(4) Bifocal lens

Subtopic:  Lenses |
 56%
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For a convex lens of focal length 15 cm the dispersive power of its material is 0.05. The longitudinal chromatic aberration of the lens is

(1) 3.6×10-4 m

(2) 700 cm

(3) 7.5 mm

(4) 1.34 μm

Subtopic:  Lenses |
 62%
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