Focal lengths of objective and eyepiece of a compound microscope are 2 cm and 6.25 cm respectively. An object AB is placed at a distance of 2.5 cm from the objective which forms the image A'B' as shown in the figure. Maximum magnifying power in this case is

1.  10

2.  20

3.  5

4.  25

 

Subtopic:  Simple & Compound Microscope |
 70%
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The refractive index of the material of prism is 2. The angle of prism A is equal to

(1) 30°

(2) 40°

(3) 60°

(4) 90°

Subtopic:  Prisms |
 64%
From NCERT
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An object is placed 20 cm in front of a concave mirror of a radius of curvature 10 cm. The position of the image from the pole of the mirror is:

1. 7.67 cm

2. 6.67 cm

3. 8.67 cm

4. 9.67 cm

Subtopic:  Reflection at Spherical Surface |
 91%
From NCERT
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A plane mirror is moving with velocity 4i^+5j^+8k^. A point object in front of the mirror moves with a velocity  3i ^+4j^+5k^, here k^ is along the normal to the plane mirror and facing towards the object. The velocity of the image is

1. -3i^-4j^+5k^

2. 7i^+9j^+11k^

3. 3i^+4j^+11k^

4. -3i^-4j^+11k^

Subtopic:  Reflection at Plane Surface |
 53%
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A candle is held \(3\) cm away from a concave mirror of focal length \(12\) cm, then the nature of the image formed by the mirror is:
1. real, inverted
2. virtual, erect
3. real, erected 
4. virtual, inverted

Subtopic:  Reflection at Spherical Surface |
 77%
From NCERT
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A plane mirror is placed at x = 0 along the y-axis and an object starts moving with velocity 2i^+2j^ m/s from x = 3. Relative velocity of the image in the mirror with respect to the object is:

 

1.  4 m/s along the -x-axis

2.  4 m/s along the +x axis

3.  22 m/s making an angle of 45° with the +x axis

4.  22 m/s making an angle of 135° with the +x axis

 

Subtopic:  Reflection at Plane Surface |
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The angle of minimum deviation for a glass prism of refractive index \(\mu = \sqrt{3}\) equals the refracting angle of the prism. The angle of the prism is:
1. \(30^{\circ}\)
2. \(60^{\circ}\)
3. \(90^{\circ}\)
4. \(45^{\circ}\)

Subtopic:  Prisms |
 78%
From NCERT
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A diverging lens of focal length 20n cm and a converging mirror of focal length 10 cm are placed 5 cm apart coaxially. Where should an object be placed so that object and its real image coincide?

1. 20 cm away from the lens

2. 60 cm away from the lens

3. 30 cm away from the lens

4. 45 cm away from the lens

Subtopic:  Refraction at Curved Surface |
 60%
From NCERT
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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%
From NCERT
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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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