The minimum distance between a real object and screen such that a convex lens of focal length 20 cm can produce a real image on the screen is

1.  20 cm

2.  40 cm

3. 80 cm

4.  60 cm

Subtopic:  Lenses | Refraction at Curved Surface |
 61%
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A, B, and C are three optical media of respective critical angles iA, iB and iC. Total internal reflection of light can occur from A to B and also from B to C but not from C to A, then the correct relation between critical angles is 

1. iA<iB<iC

2. iA>iB>iC

3. iA=iB=iC

4. iC>iA>iB

Subtopic:  Total Internal Reflection |
 55%
From NCERT
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The angle of prism for which there is no emergent ray will be(ic= critical angle)

1. 2ic

2. >ic

3. <ic

4. >2ic

Subtopic:  Prisms |
 55%
From NCERT
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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%
From NCERT
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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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