An optical element is shown in the figure. Radii of two surfaces are 10 cm and 20 cm. Calculate distance between two spherical surfaces so that image of the object coincides with the object itself

1.  100 cm

2.  80 cm

3.  110 cm

4.  95 cm

Subtopic:  Refraction at Curved Surface |
 51%
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An object and a screen are fixed at a distance d apart. When a lens of focal length f is moved between the object and screen, sharp images of the object are formed on the screen for two positions of the lens. The Magnification produced at these two positions are M1 and M2

M1=  M2 = 1

2. d > 4f

3. M1=1M2

4. Both (2)& (3) are correct

Subtopic:  Lenses |
 69%
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An object O is placed on one side of two glass slabs A and B of thickness 1.5 cm and refractive index 1.5. The position of the image of O, when viewed from the other side of slab B, will be:

1.  1 cm away from slab A

2.  1.5 cm away from slab A

3.  2 cm away from slab A

4.  2.5 cm away from slab A

Subtopic:  Refraction at Plane Surface |
 56%
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A virtual image of an object is formed by a concave lens. The lens is then coupled (kept in contact) with a convex lens. A virtual image is again formed. Then the image, now

1. Shifts away from lens system

2. Shifts towards lens system

3. Remains at its original position

4. Data are insufficient to predict whether it will shift towards or away from the lens system.

Subtopic:  Lenses |
From NCERT
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The correct statement is:

1. The intermediate image in a compound microscope is real, erect and magnified
2. Intermediate image in a compound microscope is real, inverted, but diminished
3. Intermediate image in a compound microscope is virtual, erect and magnified
4. Intermediate image in a compound microscope is real, inverted and magnified
Subtopic:  Simple & Compound Microscope |
 71%
From NCERT
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A compound microscope has two convex has a system with focal lengths 2 cm and 5 cm. An object is 2.5 cm away from the objective lens. The tube length of the microscope when magnification is maximum is equal to

1. 18.2cm

2. 14.2 cm

3. 8.2 cm

4. 4.2 cm

Subtopic:  Simple & Compound Microscope |
 67%
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A particle is thrown at an angle α=sin-135in the air as shown in the figure. The angle received from the inside water isμwater=43.

1. 15°

2. 45°

3. 30°

4. 60°

Subtopic:  Refraction at Plane Surface |
 60%
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A convex mirror of focal length f forms an image, which is 1n times the length of the object. The distance of the object from the mirror is

1.  (n - 1)f

2.  n -1nf

3.  n + 1nf

4.  (n + 1)f

Subtopic:  Reflection at Spherical Surface |
 62%
From NCERT
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We combined a convex lens of focal length f1 with a concave lens of focal length f2 and their combined focal length is F. The combination of these lenses will behave like a concave lens, if

1.  f1 > f2

2.   f1 < f2

3.   f1 = f2

4.   f1  f2

Subtopic:  Lenses |
 59%
From NCERT
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A ray of light is incident grazing on an equilateral prism of refractive Index = 2. The angle of emergence is 

1. 30°

2. 60°

3. 75°

4. 90°

Subtopic:  Prisms |
 65%
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