The refractive index of the material of an equilateral prism for yellow light is 1.5. The angle of minimum deviation of the prism for yellow light is (sin 49° = 0.75)

1. 38°

2. 30°

3. 52°

4. 60°

Subtopic:  Prisms |
 57%
From NCERT
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In case of a compound microscope, the image formed by the objective lens is

(1) Virtual, erect and diminished

(2) Real, erect and magnified

(3) Virtual, inverted and enlarged

(4) Real, inverted and enlarged

Subtopic:  Simple & Compound Microscope |
 68%
From NCERT
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A plano-convex lens of focal length 10 cm is made of glass of refractive index 1.5. If the plane surface of the convex lens is polished, then the focal length of the resultant combination will be

(1) 5 cm

(2) 10 cm

(3) 15 cm

(4) 12.5 cm

Subtopic:  Lenses |
 63%
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A parallel narrow beam of light traveling through the water in a container incident on an air bubble of radius 8 mm. What will be the distance of the image obtained due to the refraction of the beam on the first face of the air bubble from the centre of the bubble? [μwater=43]

(1) 17.2 mm

(2) 32 mm

(3) 41.5 mm

(4) 25.75 mm

Subtopic:  Refraction at Curved Surface |
 66%
From NCERT
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Two slabs P & Q of transparent materials have a thickness in ratio 2:5. If a ray of light take same time to move from A to B and B to C then refractive index of Q with respect to P will be:

 

(1) 0.4 

(2) 2.5

(3) 1.4

(4) 1.85

Subtopic:  Refraction at Plane Surface |
 60%
From NCERT
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A ray of light strikes on a glass sphere at point A. If A is midway between P and Q, then the deviation of the ray as it emerges out of the sphere will be

(1) 30°

(2) 45°

(3) 65°

(4) 85°

Subtopic:  Refraction at Curved Surface |
 75%
From NCERT
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If \(C_1,~C_2 ~\mathrm{and}~C_3\) are the critical angle of glass-air interface for red, violet and yellow color, then:

1. \(C_3>C_2>C_1\) 2. \(C_1>C_2>C_3\)
3. \(C_1=C_2=C_3\) 4. \(C_1>C_3>C_2\)
Subtopic:  Total Internal Reflection |
 67%
From NCERT
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A thin lens of focal length 10 cm is cut into two equal halves and is kept as shown in the figure. If an object O is placed at a distance 10 cm from the optical centre of combination, then the distance of the image from the object will be

(1) 5 cm

(2) 7.5 cm

(3) 10 cm

(4) 20 cm

Subtopic:  Lenses |
From NCERT
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If a glass prism of refractive index 1.5 dipped in a liquid having refractive index same as that of the material of prism, then the dispersive power of prism will

(1) Become zero

(2) Increase

(3) Remain same

(4) Depend on apex angle of prism

Subtopic:  Prisms |
 64%
From NCERT
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A concave and convex lens has the same focal length of 20 cm and are put into contact to form a lens combination. The combination is used to view an object of 5 cm length kept at 20 cm from the lens combination. As compared to the object, the image will be

1. Of the same size as the object and erect

2. Of the same size as the object but inverted

3. magnified and inverted

4. Reduced and erect

Subtopic:  Lenses |
 61%
From NCERT
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